二连盆地吉尔嘎朗图凹陷南部基底花岗岩形成演化及其大地构造背景研究

doi:10.13745/j.esf.sf.2022.2.58

地学前缘 ›› 2023, Vol. 30 ›› Issue (2): 259-271.DOI: 10.13745/j.esf.sf.2022.2.58

• 构造-岩浆作用与大地构造背景 • 上一篇下一篇

二连盆地吉尔嘎朗图凹陷南部基底花岗岩形成演化及其大地构造背景研究

郭知鑫¹^,²^,³(), 杨永太⁴^,^*(), 任祎¹, 王正庆¹^,²^,⁵, 冯志刚¹^,²^,³, 陈亮¹^,²^,³, 唐振平¹^,²^,³

1.南华大学资源环境与安全工程学院, 湖南衡阳 421001
2.湖南省稀有金属矿产开发与废物地质处置技术重点实验室, 湖南衡阳 421001
3.衡阳市核燃料循环地质理论与技术重点实验室, 湖南衡阳 421001
4.中国科学技术大学地球和空间科学学院, 中国科学院壳幔物质与环境重点实验, 安徽合肥 230026
5.东华理工大学核资源与环境国家重点实验室, 江西南昌 330013

收稿日期:2021-06-16 修回日期:2022-01-16 出版日期:2023-03-25 发布日期:2023-01-05
通讯作者: 杨永太
作者简介:郭知鑫(1989—),男,博士,讲师,主要从事沉积盆地分析、大地构造等方面的研究工作。E-mail: guozhixin@ustc.edu.cn
基金资助:
南华大学博士启动基金资助项目(200XQD044);湖南省自然科学基金青年基金项目(2022JJ40370);湖南省教育厅科学研究项目一般项目(21C0274);2021年度衡阳市指导性计划项目(202121014463);国家自然科学基金项目(41372111);2019年度核资源与环境国家重点实验室开放基金资助项目(NRE1910);2022年湖南省研究生科研创新项目(CX20220978)

Emplacement and episodic denudation of basement granites from the southern Jiergalangtu Sag, Erlian Basin and its tectonic implications

GUO Zhixin¹^,²^,³(), YANG Yongtai⁴^,^*(), REN Yi¹, WANG Zhengqing¹^,²^,⁵, FENG Zhigang¹^,²^,³, CHEN Liang¹^,²^,³, TANG Zhenping¹^,²^,³

1. School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
2. Hunan Key Laboratory of Rare Metal Minerals Exploitation and Geological Disposal of Wastes, Hengyang 421001, China
3. Hengyang Key Laboratory of Geological Theory and Technology for the Nuclear Fuel Cycle, Hengyang 421001, China
4. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
5. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, China

Received:2021-06-16 Revised:2022-01-16 Online:2023-03-25 Published:2023-01-05
Contact: YANG Yongtai

摘要/Abstract

摘要：

二连盆地是中国北方重要的油气基地、煤炭基地和铀矿床富集区。基底花岗岩是盆地重要的含铀岩系沉积物源和铀源,以及重要的油气储层。然而,至今对二连盆地基底花岗岩的形成年代、成岩后剥蚀抬升历史及其与盆地构造演化关系的认识仍然比较薄弱。本文以吉尔嘎朗图凹陷南部地区钻井揭露的基底花岗岩为研究对象,通过锆石U-Pb年龄分析、锆石和磷灰石裂变径迹年龄分析,结合盆地地层和构造演化历史,对吉尔嘎朗图凹陷南部基底花岗岩的形成和演化进行了系统研究。研究结果表明,凹陷南部地区基底花岗岩成岩时代为早侏罗世(约175 Ma),成岩后经历了晚侏罗世( (154±7) Ma、(146±7) Ma)和早白垩世中晚期( (114±8) Ma)两期冷却事件。本文认为早侏罗世花岗岩的形成与蒙古—鄂霍茨克洋板块南向俯冲有关,成岩后的两期冷却事件记录了二连盆地经历的两期挤压构造作用,其中晚侏罗世冷却事件可能与蒙古—鄂霍茨克洋的关闭有关,早白垩世中晚期的冷却事件可能与亚洲大陆东缘发生的陆-陆碰撞事件有关。

关键词: 二连盆地, 吉尔嘎朗图凹陷, 基底花岗岩, U-Pb年龄, 裂变径迹

Abstract:

The Erlian Basin is one of the most important oil, gas, coal, and uranium-bearing basins in northern China, and basement granites of the Erlian Basin are gaining importance as uranium source and petroleum reservoir. However, the emplacement time and denudation history of the basement granites are poorly studied. Here, based on newly obtained zircon U-Pb geochronological data and zircon/apatite fission track evidence, the diagenetic age and uplift history of basement granites of the southern Jiergalangtu Sag, Erlian Basin are analyzed. The diagenetic age is constrained to the Early Jurassic (ca. 175 Ma), and two cooling events are recognized. The two cooling events are refined to the Late Jurassic (ca. 154 Ma and ca. 146 Ma) and late Early Cretaceous (ca. 114 Ma), respectively, and considered to be related to the contractional deformation in the Erlian Basin. The present study tentatively attributes the formation of basement granites to the southward subduction of the Mongol-Okhotsk Ocean Block, Late Jurassic cooling to the closure of the eastern Mongol-Okhotsk Ocean, and late Early Cretaceous cooling to the collision of micro-block with East Asia.

Key words: Erlian Basin, Jiergalangtu Sag, basement granite, U-Pb age, fission track

中图分类号:

P541
P597.3

郭知鑫, 杨永太, 任祎, 王正庆, 冯志刚, 陈亮, 唐振平. 二连盆地吉尔嘎朗图凹陷南部基底花岗岩形成演化及其大地构造背景研究[J]. 地学前缘, 2023, 30(2): 259-271.

GUO Zhixin, YANG Yongtai, REN Yi, WANG Zhengqing, FENG Zhigang, CHEN Liang, TANG Zhenping. Emplacement and episodic denudation of basement granites from the southern Jiergalangtu Sag, Erlian Basin and its tectonic implications[J]. Earth Science Frontiers, 2023, 30(2): 259-271.

图/表 8

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测试点	w_B/10^-6		Th/U	同位素比值
测试点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
No.1	72.322 6	205.902 9	0.35	0.056 6	0.002 8	0.498 8	0.027 3	0.065 5	0.001 5	474	110	411	19	409	9
No.2	51.930 9	144.453 2	0.36	0.057 2	0.003 8	0.515 8	0.035 7	0.064 7	0.001 4	499	145	422	24	404	9
No.3	529.173 3	991.404 7	0.53	0.053 6	0.002 9	0.380 9	0.021 4	0.049 7	0.000 8	356	121	328	16	313	5
No.4	356.560 4	619.291 2	0.58	0.054 2	0.002 7	0.364 6	0.019 6	0.047 9	0.000 9	380	112	316	15	302	6
No.5	82.487 8	184.761 0	0.45	0.055 5	0.003 3	0.489 2	0.030 1	0.063 5	0.001 1	433	131	404	20	397	7
No.6	74.537 4	191.061 5	0.39	0.055 6	0.003 2	0.497 8	0.029 7	0.064 5	0.001 2	435	126	410	20	403	7
No.7	1 252.287 0	1 726.476 3	0.73	0.049 1	0.003 7	0.190 4	0.014 9	0.027 6	0.000 7	150	165	177	13	176	4
No.8	91.779 1	197.121 1	0.47	0.058 5	0.003 3	0.502 5	0.030 4	0.063 2	0.001 4	548	123	413	21	395	9
No.9	89.974 9	255.809 5	0.35	0.056 6	0.003 1	0.488 9	0.028 8	0.063 0	0.001 4	477	121	404	20	394	8
No.10	529.911 8	981.100 4	0.54	0.052 7	0.002 1	0.355 3	0.015 6	0.048 3	0.000 9	316	90	309	12	304	6
No.11	508.327 1	1 096.640 7	0.46	0.052 8	0.002 6	0.349 5	0.017 9	0.047 6	0.000 8	320	110	304	13	300	5
No.12	714.894 3	1 119.501 2	0.64	0.054 3	0.003 2	0.353 5	0.021 7	0.047 0	0.000 9	385	130	307	16	296	6
No.13	68.603 9	185.322 1	0.37	0.055 7	0.003 4	0.480 7	0.031 4	0.063 4	0.001 4	439	136	399	21	396	9
No.14	88.012 2	600.125 5	0.15	0.055 6	0.003 8	0.412 4	0.029 6	0.053 3	0.001 1	436	153	351	21	334	7
No.15	365.206 1	1 116.210 6	0.33	0.052 3	0.002 8	0.352 0	0.020 1	0.048 4	0.000 9	297	121	306	15	304	6
No.16	369.511 3	670.596 3	0.55	0.052 9	0.002 7	0.359 7	0.019 8	0.049 2	0.000 9	326	116	312	15	309	6
No.17	201.125 4	700.258 2	0.29	0.054 0	0.003 2	0.354 7	0.021 6	0.047 5	0.000 8	370	131	308	16	299	5
No.18	843.309 7	1 139.384 4	0.74	0.051 0	0.002 3	0.239 4	0.011 7	0.034 2	0.000 7	241	102	218	10	217	4
No.19	712.025 7	1 168.131 9	0.61	0.051 1	0.003 3	0.271 9	0.018 8	0.038 2	0.000 9	245	146	244	15	242	5
No.20	1 362.781 1	2 088.091 8	0.65	0.047 6	0.002 8	0.192 2	0.012 0	0.027 7	0.000 7	81	126	178	10	176	4
No.21	573.120 6	865.675 0	0.66	0.053 1	0.007 3	0.297 4	0.042 2	0.041 5	0.001 5	331	288	264	33	262	9
No.22	712.110 8	1 349.716 5	0.53	0.051 8	0.002 6	0.321 7	0.017 0	0.044 6	0.000 7	277	114	283	13	281	5
No.23	381.550 6	698.050 2	0.55	0.052 4	0.003 7	0.347 2	0.025 3	0.047 5	0.001 0	302	156	303	19	299	6
No.24	629.499 5	1 222.431 8	0.52	0.051 9	0.002 1	0.324 7	0.014 1	0.044 9	0.000 7	279	92	286	11	283	4
No.25	350.847 8	679.377 6	0.52	0.055 3	0.002 9	0.403 2	0.023 2	0.052 9	0.001 3	425	115	344	17	332	8
No.26	590.549 9	1 251.131 7	0.47	0.052 2	0.001 9	0.366 1	0.014 2	0.050 3	0.000 7	295	82	317	11	316	4
No.27	478.792 9	1 244.205 2	0.38	0.051 6	0.002 2	0.345 4	0.015 5	0.047 6	0.000 8	269	95	301	12	300	5
No.28	1 276.954 9	1 748.331 1	0.73	0.051 3	0.003 4	0.195 6	0.013 8	0.027 2	0.000 7	252	145	181	12	173	4

测试点	w_B/10^-6		Th/U	同位素比值
测试点	Th	U	Th/U	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ	²⁰⁷Pb/ ²⁰⁶Pb	1σ	²⁰⁷Pb/ ²³⁵U	1σ	²⁰⁶Pb/ ²³⁸U	1σ
No.1	72.322 6	205.902 9	0.35	0.056 6	0.002 8	0.498 8	0.027 3	0.065 5	0.001 5	474	110	411	19	409	9
No.2	51.930 9	144.453 2	0.36	0.057 2	0.003 8	0.515 8	0.035 7	0.064 7	0.001 4	499	145	422	24	404	9
No.3	529.173 3	991.404 7	0.53	0.053 6	0.002 9	0.380 9	0.021 4	0.049 7	0.000 8	356	121	328	16	313	5
No.4	356.560 4	619.291 2	0.58	0.054 2	0.002 7	0.364 6	0.019 6	0.047 9	0.000 9	380	112	316	15	302	6
No.5	82.487 8	184.761 0	0.45	0.055 5	0.003 3	0.489 2	0.030 1	0.063 5	0.001 1	433	131	404	20	397	7
No.6	74.537 4	191.061 5	0.39	0.055 6	0.003 2	0.497 8	0.029 7	0.064 5	0.001 2	435	126	410	20	403	7
No.7	1 252.287 0	1 726.476 3	0.73	0.049 1	0.003 7	0.190 4	0.014 9	0.027 6	0.000 7	150	165	177	13	176	4
No.8	91.779 1	197.121 1	0.47	0.058 5	0.003 3	0.502 5	0.030 4	0.063 2	0.001 4	548	123	413	21	395	9
No.9	89.974 9	255.809 5	0.35	0.056 6	0.003 1	0.488 9	0.028 8	0.063 0	0.001 4	477	121	404	20	394	8
No.10	529.911 8	981.100 4	0.54	0.052 7	0.002 1	0.355 3	0.015 6	0.048 3	0.000 9	316	90	309	12	304	6
No.11	508.327 1	1 096.640 7	0.46	0.052 8	0.002 6	0.349 5	0.017 9	0.047 6	0.000 8	320	110	304	13	300	5
No.12	714.894 3	1 119.501 2	0.64	0.054 3	0.003 2	0.353 5	0.021 7	0.047 0	0.000 9	385	130	307	16	296	6
No.13	68.603 9	185.322 1	0.37	0.055 7	0.003 4	0.480 7	0.031 4	0.063 4	0.001 4	439	136	399	21	396	9
No.14	88.012 2	600.125 5	0.15	0.055 6	0.003 8	0.412 4	0.029 6	0.053 3	0.001 1	436	153	351	21	334	7
No.15	365.206 1	1 116.210 6	0.33	0.052 3	0.002 8	0.352 0	0.020 1	0.048 4	0.000 9	297	121	306	15	304	6
No.16	369.511 3	670.596 3	0.55	0.052 9	0.002 7	0.359 7	0.019 8	0.049 2	0.000 9	326	116	312	15	309	6
No.17	201.125 4	700.258 2	0.29	0.054 0	0.003 2	0.354 7	0.021 6	0.047 5	0.000 8	370	131	308	16	299	5
No.18	843.309 7	1 139.384 4	0.74	0.051 0	0.002 3	0.239 4	0.011 7	0.034 2	0.000 7	241	102	218	10	217	4
No.19	712.025 7	1 168.131 9	0.61	0.051 1	0.003 3	0.271 9	0.018 8	0.038 2	0.000 9	245	146	244	15	242	5
No.20	1 362.781 1	2 088.091 8	0.65	0.047 6	0.002 8	0.192 2	0.012 0	0.027 7	0.000 7	81	126	178	10	176	4
No.21	573.120 6	865.675 0	0.66	0.053 1	0.007 3	0.297 4	0.042 2	0.041 5	0.001 5	331	288	264	33	262	9
No.22	712.110 8	1 349.716 5	0.53	0.051 8	0.002 6	0.321 7	0.017 0	0.044 6	0.000 7	277	114	283	13	281	5
No.23	381.550 6	698.050 2	0.55	0.052 4	0.003 7	0.347 2	0.025 3	0.047 5	0.001 0	302	156	303	19	299	6
No.24	629.499 5	1 222.431 8	0.52	0.051 9	0.002 1	0.324 7	0.014 1	0.044 9	0.000 7	279	92	286	11	283	4
No.25	350.847 8	679.377 6	0.52	0.055 3	0.002 9	0.403 2	0.023 2	0.052 9	0.001 3	425	115	344	17	332	8
No.26	590.549 9	1 251.131 7	0.47	0.052 2	0.001 9	0.366 1	0.014 2	0.050 3	0.000 7	295	82	317	11	316	4
No.27	478.792 9	1 244.205 2	0.38	0.051 6	0.002 2	0.345 4	0.015 5	0.047 6	0.000 8	269	95	301	12	300	5
No.28	1 276.954 9	1 748.331 1	0.73	0.051 3	0.003 4	0.195 6	0.013 8	0.027 2	0.000 7	252	145	181	12	173	4

二连盆地吉尔嘎朗图凹陷南部基底花岗岩形成演化及其大地构造背景研究

Emplacement and episodic denudation of basement granites from the southern Jiergalangtu Sag, Erlian Basin and its tectonic implications

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