西藏南部冈底斯带东段晚白垩世中性侵入岩的成因矿物学研究:对构建穿地壳岩浆系统的启示

doi:10.13745/j.esf.sf.2022.2.83

地学前缘 ›› 2023, Vol. 30 ›› Issue (2): 183-214.DOI: 10.13745/j.esf.sf.2022.2.83

• 构造-岩浆作用与大地构造背景 • 上一篇下一篇

西藏南部冈底斯带东段晚白垩世中性侵入岩的成因矿物学研究:对构建穿地壳岩浆系统的启示

王文鲁¹^,⁴(), 李小伟¹^,⁴^,^*(), 张泽明²^,⁴, 田作林²^,⁴, 李增胜³, 孙雨沁³, 刘强³, 丁慧霞¹, 郝昭歌¹

1.中国地质大学(北京) 成因矿物学研究中心/地质资源勘查实验教学中心, 北京 100083
2.中国地质科学院地质研究所, 北京 100037
3.山东省地质科学研究院自然资源部金矿成矿过程与资源利用重点实验室/山东省金属矿产成矿地质过程与资源利用重点实验室, 山东济南 250013
4.中国地质科学院大陆动力学集成矿物分析仪(TIMA)实验室, 北京 100037

收稿日期:2022-04-22 修回日期:2022-05-24 出版日期:2023-03-25 发布日期:2023-01-05
通信作者: 李小伟
作者简介:王文鲁(1998―),男,硕士研究生,矿物学、岩石学、矿床学专业。E-mail: 1027626328@qq.com
基金资助:
国家自然科学基金委特提斯重大研究计划重点项目(91855210);国家重点研究开发项目(2016YFC0600310)

Genetic mineralogy of Late Cretaceous intermediate intrusive rocks in the eastern segment of the Gangdese Belt, southern Tibet—construction of a trans-crustal magma system

WANG Wenlu¹^,⁴(), LI Xiaowei¹^,⁴^,^*(), ZHANG Zeming²^,⁴, TIAN Zuolin²^,⁴, LI Zengsheng³, SUN Yuqin³, LIU Qiang³, DING Huixia¹, HAO Zhaoge¹

1. Research Center of Genetic Mineralogy/Resources Exploration Experiment and Training Center, China University of Geosciences (Beijing), Beijing 100083, China
2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
3. MNR Key Laboratory of Gold Mineralization Processes and Resource Utilization/Shandong Key Laboratory of Mineralization Geological Processes and Resources Utilization in Metallic Minerals, Shandong Institute of Geological Sciences, Jinan 250013, China
4. Laboratory of TESCAN Integrated Mineral Analyzer, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received:2022-04-22 Revised:2022-05-24 Online:2023-03-25 Published:2023-01-05
Contact: LI Xiaowei

摘要/Abstract

摘要：

穿地壳岩浆系统为认识岩浆岩中矿物成因以及矿物间的不平衡关系提供了一个新的切入点,即造岩矿物在固结之前,可能在不同地壳层次的岩浆房内经历过生长、熔蚀或流体改造等过程。如何追踪和梳理不同造岩矿物的演化历史,成为阐明岩浆岩成因的一个关键科学问题。本文以西藏冈底斯弧东段里龙含单斜辉石石英闪长岩和黑云母闪长岩为主要研究对象,对其中主要造岩矿物(单斜辉石、角闪石、黑云母、斜长石等)进行了系统的成因矿物学研究,并构建了穿地壳岩浆系统的组成要素。根据矿物的稀土元素含量和不同矿物之间的接触关系,将含单斜辉石石英闪长岩中的单斜辉石和角闪石分为Ⅰ型单斜辉石(∑REE含量高)、Ⅱ型单斜辉石(∑REE含量低)、ⅠA型角闪石(∑REE含量高)、ⅠB型角闪石(∑REE含量低),将黑云母闪长岩中的角闪石命为Ⅱ型角闪石。经过矿物温压计和水活度计计算获得了相应的结晶温压条件和体系水含量。其中Ⅰ型单斜辉石为:温度1 159~1 175 ℃,压力637~799 MPa,水含量2.5%~3.4%;Ⅱ型单斜辉石为:温度1 180~1 181 ℃,压力482~524 MPa,水含量2.4%~2.8%;ⅠA型角闪石为:温度806~854 ℃,压力320~434 MPa,水含量7.5%~7.9%;ⅠB型角闪石为:温度776~848 ℃,压力196~386 MPa,水含量6.9%~8.6%;Ⅱ型角闪石为:温度783~857 ℃,压力246~327 MPa,水含量6.5%~9.4%。这表明单斜辉石的温度、压力比角闪石高,而水含量比角闪石低,暗示单斜辉石和角闪石来自不同层次的岩浆房。进一步对与单斜辉石平衡的熔体进行了计算,推断至少一部分单斜辉石来自演化的玄武安山质岩浆,而与角闪石对应的平衡熔体Mg^#值较低,对应流纹质岩浆。本研究还对单斜辉石与角闪石“再循环晶”进行了识别,指示整个岩浆过程是在开放岩浆系统中完成的,并经历了不同期次的岩浆补给或混合事件。本研究发现中性岩的母岩浆可以由不同成因的再循环晶与中酸性熔体混合形成。

关键词: 再循环晶, 单斜辉石, 角闪石, 穿地壳岩浆系统, 多重岩浆房

Abstract:

The trans-crustal magmatic system provides a new perspective for understanding the genesis of mineral and inter-mineral disequilibrium before consolidation. The rock-forming minerals may have experienced growth, erosion or fluid transformation in the magma chamber at different crustal levels. How to trace and sort out the evolutionary history of different rock-forming minerals has become a key scientific issue for understanding the genesis of magmatic rocks. We focus on the clinopyroxene-bearing quartz diorite and biotite diorite in the Lilong area on the southern margin of the Gangdese arc in Tibet to conduct a systematic morphological study of the main rock-forming minerals (clinopyroxene, amphibole, biotite, plagioclase, etc.), and to constrain the key elements of the trans-crustal magmatic system. According to the total REE (ΣREE) content of each mineral and the contact relationships between different minerals, clinopyroxene and amphibole in clinopyroxene-bearing quartz diorite are divided into type Ⅰ clinopyroxene (high ΣREE), type Ⅱ clinopyroxene (low ΣREE), type ⅠA amphibole (high ΣREE) and type ⅠB amphibole (low ΣREE). Amphibole in biotite diorite is classified as type Ⅱ amphibole. Thermobarometric and oxybarometric calculations yield the following results: type Ⅰ clinopyroxene: temperature 1159-1175 ℃, pressure 6.37-7.99 kbar, water content 2.5%-3.4%; type Ⅱ clinopyroxene: temperature 1180-1181 ℃, pressure 4.82-5.24 kbar, water content 2.4%-2.8%; Type ⅠA amphibole: temperature 806-854 ℃, pressure 3.20-4.34 kbar, water content 7.5%-7.9%; type ⅠB amphibole: temperature 776-848 ℃, pressure 1.96-3.86 kbar, water content 6.9%-8.6%; type Ⅱ amphibole: temperature 783-857 ℃, pressure 2.46-3.27 kbar, water content 6.5%-9.4%. The above results suggest that clinopyroxene and amphibole originate from different magmatic chambers, as the former has a higher temperature and pressure but lower water content than the latter. Based on the compositions of mineral melts at equilibria, it is inferred that clinopyroxene is derived from evolved basaltic-andesite magma, while amphibole melts, with lower Mg^# value, from rhyolitic magmas. In this study, the “antecrysts” of clinopyroxene and amphibole are identified, which suggest that the magmatic process was completed in an open magmatic system, and experienced different stages of magmatic recharge or mixing events. This study also finds that intermediate magmas can be produced via mixing of antecrysts of different sources with andesitic to rhyolitic melts.

Key words: antecrysts, clinopyroxene, amphibole, trans-crustal magmatic system, multiple magma chamber

中图分类号:

王文鲁, 李小伟, 张泽明, 田作林, 李增胜, 孙雨沁, 刘强, 丁慧霞, 郝昭歌. 西藏南部冈底斯带东段晚白垩世中性侵入岩的成因矿物学研究:对构建穿地壳岩浆系统的启示[J]. 地学前缘, 2023, 30(2): 183-214.

WANG Wenlu, LI Xiaowei, ZHANG Zeming, TIAN Zuolin, LI Zengsheng, SUN Yuqin, LIU Qiang, DING Huixia, HAO Zhaoge. Genetic mineralogy of Late Cretaceous intermediate intrusive rocks in the eastern segment of the Gangdese Belt, southern Tibet—construction of a trans-crustal magma system[J]. Earth Science Frontiers, 2023, 30(2): 183-214.

图/表 26

图1 区域地质图(据文献[41]修改) a—青藏高原及冈底斯构造单元划分地质简图;b—朗县至米林地区地质简图。

Fig.1 (a) Simplified geological map and tectonic units of the Tibetan Plateau and Gangdese and (b) geological map of the Langxian to Linzhi region. Modified after [41].

表1 冈底斯带东段中性岩样品汇总表

Table 1 Basic data for intermediate rock samples from eastern Gangdese, southern Tibet

样品号	岩性	采样位置	主要矿物组成	坐标
ML20-52	含单斜辉石石英闪长岩	里龙乡东侧	斜长石+单斜辉石+角闪石+黑云母+石英	29°08'01.088″N 93°54'22.434″E
LL20-17 LL20-18	含单斜辉石石英闪长岩	里龙乡	斜长石+单斜辉石+角闪石+黑云母+石英	29°07'06.120″N 93°52'12.523″E
LL20-12 LL20-13	黑云母闪长岩	义当村	斜长石+角闪石+黑云母+石英	29°05'42.800″N 93°52'20.612″E
LL20-14 LL20-15	黑云母闪长岩	义当村	斜长石+角闪石+黑云母+石英	29°05'45.476″N 93°52'20.000″E

图2 里龙中性侵入岩显微照片及背散射图像 a—含单斜辉石石英闪长岩中单斜辉石周围角闪石反应边结构;b—角闪石反应边结构;c—图2b的BSE图像;d—含单斜辉石石英闪长岩中单斜辉石与角闪石组成的嵌晶结构;e—BSE图像下的单斜辉石与角闪石组成的嵌晶结构以及角闪石的筛状结构;f—含单斜辉石石英闪长岩中角闪石的筛状结构;g—图2f筛状结构中筛孔中的斜长石与石英;h—含单斜辉石石英闪长岩中与角闪石无接触关系的单斜辉石;i—含单斜辉石石英闪长岩中单斜辉石与破碎状角闪石组成嵌晶结构;j—黑云母闪长岩中角闪石与斜长石接触;k—黑云母闪长岩中角闪石与黑云母组成嵌晶结构;l—黑云母闪长岩中角闪石的筛状结构以及其中存在的榍石。Pl—斜长石;Amp—角闪石;Bt—黑云母;Cpx—单斜辉石;Q—石英;Ttn—榍石。矿物缩写据文献[46]。

Fig.2 Photomicrographs and BSE images of Lilong intermediate rocks (a) Coronitic textures in amphibole surrounding clinopyroxene in clinopyroxene-bearing quartz diorite. (b) Coronitic textures in amphibole. (c) BSE image of Fig.2b. (d) Poikilitic textures in clinopyroxene and amphibole in clinopyroxene-bearing quartz diorite. (e) BSE image showing coronitic textures in clinopyroxene and amphibole and spongy structure of amphibole. (f) Sieve structure of amphibole in clinopyroxene-bearing quartz diorite. (g) Plagioclase and quartz in the spongy structure shown in Fig.2e. (h) Clinopyroxene in clinopyroxene-bearing quartz diorite with no contact with amphibole. (i) Poikilitic textures in clinopyroxene and broken amphibole. (j) Amphibole and plagioclase in biotite diorite. (k) Poikilitic textures in amphibole and biotite in biotite diorite. (l) Spongy structure of amphibole and titanite in biotite diorite. Pl: plagioclase; Amp: amphibole; Bt: biotite; Cpx: clinopyroxene; Q: quartz; Ttn: titanite. Mineral abbreviations after [46].

表2 里龙中性岩主微量元素数据

Table 2 Major element and trace element data of the Lilong intermediate rock

图3 里龙中性侵入岩SiO2-K2O图解(a)和A/CNK-A/NK图解(b)(a底图据文献[49];b底图据文献[50])

Fig.3 (a) K2O vs. SiO2 diagram (modified from [49]) and (b) A/CNK vs. A/NK diagram (modified from [50]) for Lilong intermediate rocks

图4 里龙中性侵入岩球粒陨石标准化稀土元素配分图(a)与原始地幔标准化微量元素蜘蛛图(b)(标准化数据引自文献[51])

Fig.4 Whole rock chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element patterns (b) for Lilong intermediate rocks. Normalized values from [51].

表3 单斜辉石主量元素数据

Table 3 Major element composition of clinopyroxenes by electron probe microanalysis

探针点号		类型	w_B/%
探针点号		类型	SiO₂	TiO₂			Al₂O₃			FeO		MnO			MgO			CaO	Na₂O		K₂O			NiO			BaO		Cr₂O₃			Total
ML20-52	1.2	Ⅰ型单斜辉石	52.4	0.16			1.99			10.7		0.62			12.6			21.6	0.62		0.01			0			0		0			100.7
ML20-52	1.4		52.1	0.12			2.12			10.9		0.68			12.9			20.7	0.48		0.02			0.05			0		0.03			100.1
ML20-52	1.6		52.6	0.18			1.68			11.3		0.66			13			20.9	0.49		0.01			0.02			0.03		0.01			100.8
ML20-52	1.7		52.6	0.14			1.76			10.8		0.6			12.7			21.2	0.46		0			0			0		0			100.3
ML20-52	2.2		52.1	0.15			1.6			10.9		0.62			13			20.7	0.55		0.03			0			0		0			99.7
ML20-52	2.3		52.4	0.13			1.62			10.1		0.65			12.8			21.4	0.54		0			0.07			0		0.01			99.7
ML20-52	3.1		52	0.13			2			9.91		0.63			12.5			22	0.42		0			0			0.01		0.01			99.6
ML20-52	3.6		52.5	0.12			1.66			10.8		0.64			12.8			21.4	0.39		0			0			0		0.03			100.3
ML20-52	4.1		52.6	0.1			1.74			11.7		0.8			13.1			20.6	0.45		0.02			0.04			0		0			101.1
ML20-52	4.2		52.4	0.11			2.12			11.3		0.78			12.9			21	0.45		0			0			0.01		0			101
LL20-17	1.4		54.6	0.11			1.31			8.28		0.76			13.5			21.5	0.41		0.01			0			0.02		0.05			100.5
LL20-17	1.7		52.1	0.13			1.31			8.86		0.69			13.8			22.3	0.51		0.02			0			0		0.03			99.8
LL20-17	4.2		52.4	0.09			1.05			8.41		0.75			13.8			22.5	0.44		0			0.07			0.02		0			99.5
LL20-17	4.1		52.3	0.08			0.97			8.51		0.82			13.8			22.4	0.49		0.01			0			0		0.03			99.4
LL20-18	1.2	Ⅱ型单斜辉石	51.6	0.13			1.79			10.6		0.91			13.2			20.9	0.44		0			0			0.02		0.01			99.6
LL20-18	1.4		51.9	0.16			1.74			10.5		1.03			13.3			21.1	0.43		0			0			0		0.04			100.3
LL20-18	1.5		51.9	0.11			1.77			9.48		0.96			13.4			21.7	0.48		0.01			0.04			0		0			99.8
探针点号		类型	以6个氧原子和4个阳离子为基准计算的阳离子数
探针点号		类型	Si		Al^Ⅳ			Al^Ⅵ			Ti			Fe³⁺			Fe²⁺			Mn		Mg			Ca			Na			K
ML20-52	1.2	Ⅰ型单斜辉石	1.96		0.04			0.05			0			0.05			0.28			0.02		0.7			0.87			0.04			0
ML20-52	1.4		1.96		0.04			0.05			0			0.03			0.31			0.02		0.72			0.83			0.03			0
ML20-52	1.6		1.96		0.04			0.04			0			0.04			0.32			0.02		0.72			0.84			0.04			0
ML20-52	1.7		1.97		0.03			0.05			0			0.01			0.33			0.02		0.71			0.85			0.03			0
ML20-52	2.2		1.97		0.03			0.04			0			0.04			0.3			0.02		0.73			0.84			0.04			0
ML20-52	2.3		1.97		0.03			0.04			0			0.02			0.29			0.02		0.72			0.86			0.04			0
ML20-52	3.1		1.96		0.04			0.05			0			0.02			0.29			0.02		0.7			0.89			0.03			0
ML20-52	3.6		1.97		0.03			0.04			0			0.02			0.32			0.02		0.72			0.86			0.03			0
ML20-52	4.1		1.96		0.04			0.04			0			0.04			0.32			0.03		0.73			0.82			0.03			0
ML20-52	4.2		1.95		0.05			0.05			0			0.04			0.31			0.02		0.72			0.84			0.03			0
LL20-17	1.4		2.01		0			0.06			0			0			0.26			0.02		0.74			0.85			0.03			0
LL20-17	1.7		1.96		0.04			0.01			0			0.09			0.19			0.02		0.77			0.9			0.04			0
LL20-17	4.2		1.97		0.03			0.02			0			0.06			0.2			0.02		0.78			0.91			0.03			0
LL20-17	4.1		1.97		0.03			0.01			0			0.07			0.19			0.03		0.77			0.9			0.04			0
LL20-18	1.2	Ⅱ型单斜辉石	1.95		0.05			0.03			0			0.07			0.27			0.03		0.75			0.85			0.03			0
LL20-18	1.4		1.95		0.05			0.03			0			0.06			0.26			0.03		0.75			0.85			0.03			0
LL20-18	1.5		1.95		0.05			0.03			0			0.07			0.23			0.03		0.75			0.87			0.04			0
探针点号		类型	Wo			En			Fs				Mg^#			M $g 平衡熔体 #$				温度/℃			压力/MPa			深度/km				水含量_melt/%
ML20-52	1.2	Ⅰ型单斜辉石	44.1			35.7			18				71			40				1 175			714			26				3.2
ML20-52	1.4		42.7			36.9			18.6				70			39				1 173			799			28.7				2.8
ML20-52	1.6		42.5			36.7			18.9				70			39				1 170			699			25.6				2.8
ML20-52	1.7		43.7			36.4			18.2				69			38				1 164			737			26.8				3
ML20-52	2.2		42.5			37			18.4				71			40				1 172			721			26.3				2.8
ML20-52	2.3		44			36.7			17.3				71			40				1 166			711			25.9				3.2
ML20-52	3.1		45.4			36			17				71			40				1 159			655			24.2				3.4
ML20-52	3.6		43.8			36.5			18.3				69			38				1 166			637			23.6				3
ML20-52	4.1		41.9			36.9			19.7				69			38				1 174			702			25.7				2.6
ML20-52	4.2		42.8			36.5			19.1				70			39				1 172			754			27.3				2.9
LL20-17	1.4		44.7			39			14.8				74			44				1 167			665			24.5				2.5
LL20-17	1.7		44.8			38.5			14.9				80			53				1 174
LL20-17	4.2		45.3			38.8			14.3				79			51				1 171
LL20-17	4.1		45			38.6			14.6				80			52				1 172
LL20-18	1.2	Ⅱ型单斜辉石	42.7			37.5			18.2				74			44				1 181			524			20.1				2.6
LL20-18	1.4		42.7			37.5			18.2				74			44				1 181			482			18.7				2.4
LL20-18	1.5		44			37.7			16.5				77			47				1 180			495			19.1				2.8

表3 单斜辉石主量元素数据

Table 3 Major element composition of clinopyroxenes by electron probe microanalysis

探针点号		类型	w_B/%
探针点号		类型	SiO₂	TiO₂			Al₂O₃			FeO		MnO			MgO			CaO	Na₂O		K₂O			NiO			BaO		Cr₂O₃			Total
ML20-52	1.2	Ⅰ型单斜辉石	52.4	0.16			1.99			10.7		0.62			12.6			21.6	0.62		0.01			0			0		0			100.7
ML20-52	1.4		52.1	0.12			2.12			10.9		0.68			12.9			20.7	0.48		0.02			0.05			0		0.03			100.1
ML20-52	1.6		52.6	0.18			1.68			11.3		0.66			13			20.9	0.49		0.01			0.02			0.03		0.01			100.8
ML20-52	1.7		52.6	0.14			1.76			10.8		0.6			12.7			21.2	0.46		0			0			0		0			100.3
ML20-52	2.2		52.1	0.15			1.6			10.9		0.62			13			20.7	0.55		0.03			0			0		0			99.7
ML20-52	2.3		52.4	0.13			1.62			10.1		0.65			12.8			21.4	0.54		0			0.07			0		0.01			99.7
ML20-52	3.1		52	0.13			2			9.91		0.63			12.5			22	0.42		0			0			0.01		0.01			99.6
ML20-52	3.6		52.5	0.12			1.66			10.8		0.64			12.8			21.4	0.39		0			0			0		0.03			100.3
ML20-52	4.1		52.6	0.1			1.74			11.7		0.8			13.1			20.6	0.45		0.02			0.04			0		0			101.1
ML20-52	4.2		52.4	0.11			2.12			11.3		0.78			12.9			21	0.45		0			0			0.01		0			101
LL20-17	1.4		54.6	0.11			1.31			8.28		0.76			13.5			21.5	0.41		0.01			0			0.02		0.05			100.5
LL20-17	1.7		52.1	0.13			1.31			8.86		0.69			13.8			22.3	0.51		0.02			0			0		0.03			99.8
LL20-17	4.2		52.4	0.09			1.05			8.41		0.75			13.8			22.5	0.44		0			0.07			0.02		0			99.5
LL20-17	4.1		52.3	0.08			0.97			8.51		0.82			13.8			22.4	0.49		0.01			0			0		0.03			99.4
LL20-18	1.2	Ⅱ型单斜辉石	51.6	0.13			1.79			10.6		0.91			13.2			20.9	0.44		0			0			0.02		0.01			99.6
LL20-18	1.4		51.9	0.16			1.74			10.5		1.03			13.3			21.1	0.43		0			0			0		0.04			100.3
LL20-18	1.5		51.9	0.11			1.77			9.48		0.96			13.4			21.7	0.48		0.01			0.04			0		0			99.8
探针点号		类型	以6个氧原子和4个阳离子为基准计算的阳离子数
探针点号		类型	Si		Al^Ⅳ			Al^Ⅵ			Ti			Fe³⁺			Fe²⁺			Mn		Mg			Ca			Na			K
ML20-52	1.2	Ⅰ型单斜辉石	1.96		0.04			0.05			0			0.05			0.28			0.02		0.7			0.87			0.04			0
ML20-52	1.4		1.96		0.04			0.05			0			0.03			0.31			0.02		0.72			0.83			0.03			0
ML20-52	1.6		1.96		0.04			0.04			0			0.04			0.32			0.02		0.72			0.84			0.04			0
ML20-52	1.7		1.97		0.03			0.05			0			0.01			0.33			0.02		0.71			0.85			0.03			0
ML20-52	2.2		1.97		0.03			0.04			0			0.04			0.3			0.02		0.73			0.84			0.04			0
ML20-52	2.3		1.97		0.03			0.04			0			0.02			0.29			0.02		0.72			0.86			0.04			0
ML20-52	3.1		1.96		0.04			0.05			0			0.02			0.29			0.02		0.7			0.89			0.03			0
ML20-52	3.6		1.97		0.03			0.04			0			0.02			0.32			0.02		0.72			0.86			0.03			0
ML20-52	4.1		1.96		0.04			0.04			0			0.04			0.32			0.03		0.73			0.82			0.03			0
ML20-52	4.2		1.95		0.05			0.05			0			0.04			0.31			0.02		0.72			0.84			0.03			0
LL20-17	1.4		2.01		0			0.06			0			0			0.26			0.02		0.74			0.85			0.03			0
LL20-17	1.7		1.96		0.04			0.01			0			0.09			0.19			0.02		0.77			0.9			0.04			0
LL20-17	4.2		1.97		0.03			0.02			0			0.06			0.2			0.02		0.78			0.91			0.03			0
LL20-17	4.1		1.97		0.03			0.01			0			0.07			0.19			0.03		0.77			0.9			0.04			0
LL20-18	1.2	Ⅱ型单斜辉石	1.95		0.05			0.03			0			0.07			0.27			0.03		0.75			0.85			0.03			0
LL20-18	1.4		1.95		0.05			0.03			0			0.06			0.26			0.03		0.75			0.85			0.03			0
LL20-18	1.5		1.95		0.05			0.03			0			0.07			0.23			0.03		0.75			0.87			0.04			0
探针点号		类型	Wo			En			Fs				Mg^#			M $g 平衡熔体 #$				温度/℃			压力/MPa			深度/km				水含量_melt/%
ML20-52	1.2	Ⅰ型单斜辉石	44.1			35.7			18				71			40				1 175			714			26				3.2
ML20-52	1.4		42.7			36.9			18.6				70			39				1 173			799			28.7				2.8
ML20-52	1.6		42.5			36.7			18.9				70			39				1 170			699			25.6				2.8
ML20-52	1.7		43.7			36.4			18.2				69			38				1 164			737			26.8				3
ML20-52	2.2		42.5			37			18.4				71			40				1 172			721			26.3				2.8
ML20-52	2.3		44			36.7			17.3				71			40				1 166			711			25.9				3.2
ML20-52	3.1		45.4			36			17				71			40				1 159			655			24.2				3.4
ML20-52	3.6		43.8			36.5			18.3				69			38				1 166			637			23.6				3
ML20-52	4.1		41.9			36.9			19.7				69			38				1 174			702			25.7				2.6
ML20-52	4.2		42.8			36.5			19.1				70			39				1 172			754			27.3				2.9
LL20-17	1.4		44.7			39			14.8				74			44				1 167			665			24.5				2.5
LL20-17	1.7		44.8			38.5			14.9				80			53				1 174
LL20-17	4.2		45.3			38.8			14.3				79			51				1 171
LL20-17	4.1		45			38.6			14.6				80			52				1 172
LL20-18	1.2	Ⅱ型单斜辉石	42.7			37.5			18.2				74			44				1 181			524			20.1				2.6
LL20-18	1.4		42.7			37.5			18.2				74			44				1 181			482			18.7				2.4
LL20-18	1.5		44			37.7			16.5				77			47				1 180			495			19.1				2.8

表4 单斜辉石微量元素数据

Table 4 LA- ICP-MS in- situ trace elements analysis data of clinopyroxenes

表5 角闪石主量元素数据

Table 5 Major element composition of amphibole by electron probe microanalysis

表6 角闪石微量元素数据

Table 6 LA- ICP-MS in-situ trace elements analysis data of amphibole

表7 斜长石主量元素数据

Table 7 Major element composition of plagoclase by electron probe microanalysis

表8 黑云母主、微量元素数据

Table 8 Major element composition by electron probe microanalysis and LA-ICP MS in-situ trace elements analysis data of biotite

图5 里龙中性侵入岩中辉石三端员分类图(a)、角闪石分类图(b)、斜长石分类图(c)和黑云母分类图(d) (a底图据文献[57];b底图据文献[58];c,d底图据文献[59])

Fig.5 Classification diagrams for Lilong intermediate rocks. (a) Pyroxenes (after [57]). (b) Calcic amphiboles (after [58]). (c) Plagioclases (after [59]). (d) Biotite (after [59]).

图6 里龙中性侵入岩中单斜辉石与角闪石球粒陨石标准化稀土元素分布图(a,c,e)和原始地幔标准化微量元素蜘蛛图(b,d,f)(标准化值引自文献[51])

Fig.6 Chondrite-normalized REE distribution patterns (a, c, e) and primitive mantle-normalized trace element distribution patterns (b, d, f) for different types of clinopyroxenes and amphiboles from Lilong intermediate rocks. Normalized values from [51].

图7 含单斜辉石石英闪长岩中筛状结构角闪石包裹单斜辉石组成的嵌晶结构背散射图像及重要主、微量元素面扫描结果元素分布结果以概率密度显示。BSE图像中核部为单斜辉石,边部为角闪石;橙色线A到B为剖面位置。

Fig.7 BSE images and quantitative major and trace element mapping by LA-ICP-MS of spongy amphibole wrapping around clinopyroxene in clinopyroxene-bearing diorite. In BSE image, red circle indicates clinopyroxene core with amphibole on the peripheral; orange line indicates profiling line AB. Color scheme for element maps is based on probability density of element to accentuate distribution characteristics.

图8 筛状结构角闪石包裹单斜辉石面扫描AB剖面元素含量变化图(剖面位置如图7)

Fig.8 Variations along AB line (position see Fig.7) of important elements in spongy amphibole wrapping around clinopyroxene

图9 据文献[56]和[62]方法计算得到的角闪石温压结果对比图(a,b)和角闪石结晶温度与平衡熔体SiO2含量(c)、结晶温度与熔体H2O含量(d)图解

Fig.9 Temperature (a, after [56,62]) and pressure (b, after [56,62]) contrast diagrams, and plots of temperature vs. SiO2 contents in melt at equilibrium (c) and temperature vs. magmatic water content in melt (d) for amphibole

表9 单斜辉石平衡熔体重要微量元素数据

Table 9 Trace element composition of calculated equilibrated melts with clinopyroxene

图10 里龙中性侵入岩中单斜辉石(a)和角闪石(b,c)平衡熔体稀土模式配分图(标准化值来自文献[51]) 全岩稀土模式为所有样品的平均含量。

Fig.10 Chondrite-normalized REE distribution patterns for clinopyroxenes (a) and amphibole (b, c) from Lilong intermediate rock melts at equilibrium. Normalized values from [51]; whole rock REE value for each element averaged over all samples.

表10 角闪石平衡熔体主量元素数据

Table 10 Major element composition of calculated equilibrated melts with amphibole

标号		类型	w_B/%							Mg^#
标号		类型	SiO₂	TiO₂	FeO	MgO	CaO	K₂O	Al₂O₃	Mg^#
ML20-52	1.3	ⅠA型角闪石	76.8	0.21	1.87	0.44	2.73	4.06	15.5	30
ML20-52	1.J1		78.2	0.17	2.07	0.57	3.26	3.27	15.4	33
ML20-52	1.J2		75.2	0.22	2.26	0.48	2.81	4.39	16.1	27
ML20-52	1.J5		77.3	0.21	1.83	0.46	3.17	3.56	15.4	31
LL20-17	4.4	ⅠB型角闪石	80.5	0.16	1.03	0.26	2.23	3.93	14.1	31
LL20-17	4.6		79.7	0.17	1.1	0.27	2.38	3.95	14.4	31
LL20-18	2.4		74.3	0.29	1.97	0.45	2.85	4.22	15.6	29
LL20-18	2.5		74.6	0.3	1.94	0.45	2.88	4.17	15.4	29
LL20-18	4.3		75.4	0.26	1.79	0.37	2.55	4.24	15.2	27
LL20-18	4.4		75.5	0.25	1.77	0.39	2.6	4.28	15.3	28
LL20-18	4.5		75.9	0.24	1.92	0.44	2.67	4.22	15.5	29
LL20-18	4.6		75.4	0.26	1.85	0.42	2.67	4.2	15.5	29
LL20-12	1.3	Ⅱ型角闪石	76.7	0.26	1.91	0.46	2.77	3.47	14.9	30
LL20-12	1.4		76.7	0.24	1.93	0.44	2.65	3.43	14.8	29
LL20-12	1.8		76.8	0.26	1.9	0.48	2.9	3.52	15	31
LL20-12	2.2		75.5	0.3	2.25	0.54	2.98	3.46	15.2	30
LL20-13	1.2		75.8	0.3	2.01	0.46	2.74	3.73	14.9	29
LL20-13	1.3		75.4	0.29	2.15	0.47	2.74	3.59	15.1	28
LL20-13	2.1		77.4	0.25	1.8	0.43	2.64	3.71	14.8	30
LL20-13	2.3		74.4	0.28	3.09	0.75	3.04	3.6	15.5	30
LL20-13	2.5		76.2	0.29	2.11	0.48	2.78	3.84	15.1	29
LL20-15	4.3		78.2	0.21	1.38	0.3	2.44	4.14	15	28
LL20-15	4.4		78.1	0.21	1.49	0.34	2.62	4.11	15.5	29

表11 角闪石微量元素分配系数及平衡熔体重要微量元素数据

Table 11 Partition coefficient and trace element composition of calculated equilibrated melts with amphibole

图11 里龙中性侵入岩中单斜辉石(a)和角闪石(b)与寄主岩平衡图解图中虚线范围为矿物与熔体平衡范围(据文献[75])。单斜辉石与平衡熔体的Fe-Mg交换系数(0.28±0.08)据文献[53];角闪石与平衡熔体的Fe-Mg交换系数(0.28±0.11)据文献[62]。

Fig.11 Equilibrium tests between clinopyroxenes (a) and amphibole (b) and their host rocks of Lilong intermediate rocks. The dotted curves after reference [75] represent the range of equilibrium compositions between mineral and melt using an Fe-Mg distribution coefficient of 0.28±0.08 for clinopyroxene (after reference [53]) and 0.28±0.11 for amphibole (after reference [62]).

图12 角闪石平衡熔体的主量元素组分与全岩组分的比较

Fig.12 Cross-plots of major oxide contents vs. SiO2 content in amphibole melt at equilibrium in comparison with whole-rock data

表12 里龙中性岩中部分造岩矿物主要特征

Table 12 Main features of some rock-forming minerals in intermediate rocks from the Lilong area

岩性	矿物	Mg^#	M $g 平衡熔体 #$	An	Nb/Ta	Nb/Ta _平衡熔体	Sr/Y	Sr/Y_平衡熔体	∑REE含量/ 10^-6	深度/km
含单斜辉石石英闪长岩	Ⅰ型单斜辉石	69~80	38~53				0.18~0.48	0.59~1.55	76.1~185.2	23.6~28.7
含单斜辉石石英闪长岩	Ⅱ型单斜辉石	74~77	44~47				0.80~0.91	2.57~2.91	51.5~58.8	18.7~20.1
含单斜辉石石英闪长岩	ⅠA型角闪石	62~63	27~33		13.4~14.9	12.6~14.0	0.23~0.28	4.59~6.53	471.2~530.2	12.2~16.4
含单斜辉石石英闪长岩	ⅠB型角闪石	61~67	27~31		12.3~22.2	11.6~20.9	0.70~0.85	10.7~18.29	104.7~196.2	7.7~15.1
黑云母闪长岩	Ⅱ型角闪石	59~66	29~36		13.3~22.2	12.5~20.9	0.56~1.61	9.53~30.7	129.6~200	9.5~12.6
两种岩性都存在	斜长石			35~48
含单斜辉石石英闪长岩	黑云母				12.1~21.7	3.63~6.50				6.22~7.44
黑云母闪长岩	黑云母				9.40~12.0	2.83~3.59				6.76~7.24

表12 里龙中性岩中部分造岩矿物主要特征

Table 12 Main features of some rock-forming minerals in intermediate rocks from the Lilong area

岩性	矿物	Mg^#	M $g 平衡熔体 #$	An	Nb/Ta	Nb/Ta _平衡熔体	Sr/Y	Sr/Y_平衡熔体	∑REE含量/ 10^-6	深度/km
含单斜辉石石英闪长岩	Ⅰ型单斜辉石	69~80	38~53				0.18~0.48	0.59~1.55	76.1~185.2	23.6~28.7
含单斜辉石石英闪长岩	Ⅱ型单斜辉石	74~77	44~47				0.80~0.91	2.57~2.91	51.5~58.8	18.7~20.1
含单斜辉石石英闪长岩	ⅠA型角闪石	62~63	27~33		13.4~14.9	12.6~14.0	0.23~0.28	4.59~6.53	471.2~530.2	12.2~16.4
含单斜辉石石英闪长岩	ⅠB型角闪石	61~67	27~31		12.3~22.2	11.6~20.9	0.70~0.85	10.7~18.29	104.7~196.2	7.7~15.1
黑云母闪长岩	Ⅱ型角闪石	59~66	29~36		13.3~22.2	12.5~20.9	0.56~1.61	9.53~30.7	129.6~200	9.5~12.6
两种岩性都存在	斜长石			35~48
含单斜辉石石英闪长岩	黑云母				12.1~21.7	3.63~6.50				6.22~7.44
黑云母闪长岩	黑云母				9.40~12.0	2.83~3.59				6.76~7.24

图13 单斜辉石AlIV与La图解(a)和AlIV与Hf图解(b)(底图据文献[92])

Fig.13 AlIV vs. La (a) and Hf (b) diagrams for clinopyroxene. Modified after [92].

图14 里龙中性侵入岩穿地壳岩浆系统模式简图

Fig.14 Schematic model of a trans-crustal magmatic system revealed by the Lilong intermediate intrusive rocks

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西藏南部冈底斯带东段晚白垩世中性侵入岩的成因矿物学研究:对构建穿地壳岩浆系统的启示

Genetic mineralogy of Late Cretaceous intermediate intrusive rocks in the eastern segment of the Gangdese Belt, southern Tibet—construction of a trans-crustal magma system

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