地学前缘 ›› 2024, Vol. 31 ›› Issue (3): 199-217.DOI: 10.13745/j.esf.sf.2023.12.60
陈可1,2(), 邵拥军1,2, 刘忠法1,2,*(
), 张俊柯1,2, 李永顺1,2, 陈雨莹1,2
收稿日期:
2022-11-26
修回日期:
2023-12-15
出版日期:
2024-05-25
发布日期:
2024-05-25
通信作者:
*刘忠法(1982—),男,副教授,从事矿床学及地球化学研究。E-mail: 作者简介:
陈可(1996—),男,博士研究生,地质学专业。E-mail: chenke1026@csu.edu.cn
基金资助:
CHEN Ke1,2(), SHAO Yongjun1,2, LIU Zhongfa1,2,*(
), ZHANG Junke1,2, LI Yongshun1,2, CHEN Yuying1,2
Received:
2022-11-26
Revised:
2023-12-15
Online:
2024-05-25
Published:
2024-05-25
摘要:
冬瓜山铜(金)矿床和新桥硫铁铜金矿床是铜陵矿集区内两个大型夕卡岩型矿床,二者成矿地质背景相似,矿体产于同一地层层位,冬瓜山矿床以黄铜矿和磁黄铁矿为主,新桥矿床以黄铁矿和磁铁矿为主,二者矿物组合差异性非常明显,但造成二者矿物组合差异的关键控制因素还不清楚。针对这一科学问题,本文以二者成矿岩体中的角闪石和斜长石为研究对象,拟揭示岩浆因素对二者差异性矿化的控制作用。冬瓜山矿床青山脚石英二长闪长岩和新桥矿床矶头石英闪长岩角闪石和斜长石岩相学和电子探针(EPMA)主量元素和LA-ICP-MS微量元素分析结果显示,青山脚岩体中的角闪石大部分属于镁角闪石系列;矶头岩体中的角闪石大部分属于镁角闪石和浅闪石系列。青山脚岩体和矶头岩体的角闪石结晶压力、结晶温度、结晶深度、氧逸度和含水量分别为41~306 MPa和23~225 MPa,691~916 ℃和634~918 ℃,1.6~11.6 km和0.9~8.5 km,ΔNNO=0~2.3和ΔNNO=-0.4~2.4,3.7%~5.5%和3.1%~5.4%,青山脚和矶头岩体内角闪石以地壳型为主,少部分为壳幔混合型。两个岩体中斜长石多为中长石,根据斜长石结构和成分剖面特征,推测青山脚和矶头岩体晶体群分别来自5个和4个不同的岩浆子系统,都经历了镁铁质岩浆的注入和混合作用。我们认为镁铁质岩浆中氧逸度和元素含量的差异控制了冬瓜山和新桥的差异性矿化。
中图分类号:
陈可, 邵拥军, 刘忠法, 张俊柯, 李永顺, 陈雨莹. 岩浆因素对中国东部铜陵矿集区差异性矿化的控制作用:来自角闪石、斜长石矿物学证据[J]. 地学前缘, 2024, 31(3): 199-217.
CHEN Ke, SHAO Yongjun, LIU Zhongfa, ZHANG Junke, LI Yongshun, CHEN Yuying. The controlling role of magmatic factors on the differential mineralization in the Tongling ore district, eastern China: Evidence from the mineralogy of amphibole and plagioclase[J]. Earth Science Frontiers, 2024, 31(3): 199-217.
图3 (a)狮子山矿田地质图;(b)冬瓜山矿床典型剖面图 (a据文献[27]修改;b据文献[32]修改)
Fig.3 (a) Geological map of the Shizishan ore field; (b) Typical cross-section of the Dongguashan deposit. a modified after [27]; b modified after [32].
图4 (a)新桥矿田地质图;(b)新桥矿床典型剖面图 (a据文献[23]修改;b据文献[31]修改)
Fig.4 (a) Geological map of the Xinqiao ore field; (b) Typical cross-section of the Xinqiao deposit. a modified after [23]; b modified after [31].
图5 青山脚和矶头石英(二长)闪长岩手标本及镜下照片 Amp—角闪石;Pl—斜长石;Qtz—石英;Bt—黑云母。
Fig.5 Hand specimens and microscopic photos of Qingshanjiao and Jitou quartz (oligoclase) diorites
图6 青山脚和矶头石英(二长)闪长岩角闪石分类图(引自文献[38])
Fig.6 Classification diagram of amphibole in Qingshanjiao and Jitou quartz (oligoclase) diorites. Adapted from [38].
图8 青山脚岩体中斜长石的背散射照片(左)和成分剖面(右)
Fig.8 Backscattered electron images (left) and the composition profiles (right) of the representative plagioclase grains in the Qingshanjiao pluton
图10 矶头岩体中斜长石的背散射照片(左)和成分剖面(右)
Fig.10 Backscattered electron images (left) and the composition profiles (right) of the representative plagioclase grains in the Jitou pluton
图12 青山脚岩体中角闪石的背散射照片(左)和成分剖面(右)
Fig.12 BSE images(left) and the composition profiles (right) of the representative amphibole grains in the Qingshanjiao pluton
图13 矶头岩体中角闪石的背散射照片(左)和成分剖面(右)
Fig.13 BSE images (left) and the composition profiles (right) of the representative amphibole grains in the Jitou pluton
图14 青山脚和矶头石英(二长)闪长岩角闪石p-T(a)、$\lg f_{\mathrm{O}_{2}}$ -T(b)、H2Omelt-p(c)和ΔNNO-h(d)图解
Fig.14 p-T(a),$\lg f_{\mathrm{O}_{2}}$ -T(b),H2Omelt-p(c) and ΔNNO-h(d) plots for amphibole from the Qingshanjiao and Jitou quartz (monzo) diorite
图15 青山脚和矶头石英(二长)闪长岩角闪石Si-(Si+Ti+Al)(a)、Mg-(Mg+Fe2+)(b)、TiO2-Al2O3(c)、(Na+K)-IVAl(d)、AlT-Si(e)和Ca-(Fe2++Fe3+)-Mg(f)图解
Fig.15 Si-(Si+Ti+Al)(a),Mg-(Mg+Fe2+)(b),TiO2-Al2O3(c),(Na+K)-IVAl(d),AlT-Si(e) and Ca-(Fe2++Fe3+)-Mg(f) plots for amphibole from the Qingshanjiao and Jitou quartz (monzo) diorite
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