下扬子地区下寒武统幕府山组黑色岩系地球化学特征及其地质意义

doi:10.14027/j.issn.1000-0550.2019.076

下扬子地区下寒武统幕府山组黑色岩系地球化学特征及其地质意义

doi: 10.14027/j.issn.1000-0550.2019.076

基金项目:

中国地质调查局油气地质调查项目 DD20160183

重点地区构造体系及油气页岩气控藏条件调查 DD20190085

详细信息

作者简介:
：侯阳红，男，1993年出生，硕士研究生，矿产普查与勘探，E⁃mail: 827732143@qq.com

通讯作者:
康志宏，男，教授，E⁃mail: kangzh98@163.com

中图分类号: P618.13 P595
计量
- 文章访问数: 243
- HTML全文浏览量: 188
- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2019-05-15
- 发布日期: 2020-08-10

Geochemical Characteristics and Geological Significance of the Black Rock Series at the Bottom of the Mufushan Formation in the Lower Cambrian, Lower Yangtze Area

Funds:

Petroleum Geological Survey Project of China Geological Survey DD20160183

Investigation of Tectonic Systems and Control Conditions of Oil and Gas and Shale Gas in Key Areas DD20190085

摘要

摘要: 为探讨下扬子地区下寒武统幕府山组底部富有机质黑色岩系的物源属性及源区构造背景特征，在南京幕府山剖面幕府山组底部系统的采集样品，并对其进行地球化学测试与分析。Th/Sc⁃Zr/Sc图解表明幕府山组黑色岩系未曾经历沉积再循环；通过分析主量元素比值特征、稀土元素（REE）配分模式、δEu、（La/Yb）_N及La/Th⁃Hf和La/Yb⁃∑REE判别图解，认为幕府山组黑色岩系源岩主要是花岗岩和富含长英质矿物的沉积岩等上地壳长英质岩石，存在基性岩的混入。从物源属性、地质年代关系、华南大陆构造演化历程等多方面考虑，源岩中花岗岩成分主要为新元古时期岩浆活动形成的岩浆岩，物源区为江南古陆（江南造山带）。通过分析K₂O+Na₂O⁃SiO₂、K₂O/Na₂O⁃SiO₂/Al₂O₃、La⁃Th⁃Sc、Th⁃Co⁃Zr/10和Th⁃Sc⁃Zr/10图解，认为幕府山组黑色岩系源区构造背景为被动大陆边缘。
- 幕府山组 /
- 黑色岩系 /
- 地球化学 /
- 物源 /
- 构造背景
Abstract: In order to investigate the provenance and tectonic setting for the source of the organic⁃rich black rock series from the Lower Cambrian Mufushan Formation in the Lower Yangtze area, samples were collected systematically from the bottom of the Mufushan Formation in the Mufushan section in Nanjing, and geochemical tests and analysis were conducted on the samples. The chemical alteration index (CIA) and Th/U values are important chemical parameters for judging the degree of weathering in the source region. The CIA and Th/U values of the sample indicate that the source rock has experienced weak⁃medium intensity weathering, and the Th/Sc⁃Zr/Sc diagram shows that the black rock series in the area has not experienced sedimentary recirculation. By analyzing the ratio characteristics of the major elements, the distribution patterns of rare earth elements (REE), δEu, (La/Yb)N, La/Th⁃Hf, and the La/Yb⁃∑REE diagrams, we find that the source rock of the Mufushan Formation black rock series is mainly upper crust felsic rocks such as granite and sedimentary rocks rich in felsic minerals, and there are mixed rocks of basic rocks. Considering the source property, geological age, and tectonic evolution process of the South China continent, the granite composition in the source rocks is mainly composed of magmatic rocks that formed during the Neoproterozoic period, and the source area is Ghiangnania. By analyzing the diagrams of K₂O+Na₂O⁃SiO₂, K₂O/Na₂O⁃SiO₂/Al₂O₃, La⁃Th⁃Sc, Th⁃Co⁃Zr/10, and Th⁃Sc⁃Zr/10, we determine that the tectonic setting of the black rock source area of the Mufushan Formation is the passive continental margin.
- Mufushan Formation /
- black rock series /
- geochemistry /
- provenance /
- tectonic setting

HTML全文

图 1 研究区构造位置及构造单元划分简图（据刘小平等^[10]，有修改）

Figure 1. Tectonic location and division of the geotectonic system unit in the study area (modified from Liu et al. ^[10])

Fig.1

下载: 全尺寸图片幻灯片

图 2 幕府山剖面幕府山组岩性及取样位置

Figure 2. Lithology and sample locations of the Mufushan Formation in the Mufushan section

Fig.2

下载: 全尺寸图片幻灯片

图 3 南京幕府山剖面寒武系幕府山组底部野外露头

Figure 3. Outcrop from the bottom of the Cambrian Mufushan Formation in the Mufushan section of Nanjing

Fig.3

下载: 全尺寸图片幻灯片

图 4 幕府山剖面幕府山组黑色岩系微量元素及稀土元素PAAS标准化蜘蛛网图（PAAS数据来自 Taylor et al.^[13]（a）微量元素；（b）稀土元素）

Figure 4. PAAS⁃normalized spider diagram of trace elements and REEs of the black rock system from the Mufushan Formation in the Mufushan section

Fig.4

下载: 全尺寸图片幻灯片

图 5 幕府山剖面幕府山组黑色岩系Th/U和Th关系（底图据McLennan et al.^[16]）

Figure 5. Th/U⁃Th diagram of the black rock series from the Mufushan Formation in the Mufushan section (base map after McLennan et al.^[16])

Fig.5

下载: 全尺寸图片幻灯片

图 6 幕府山剖面幕府山组黑色岩系Th/Sc⁃Zr/Sc图（底图据Lambeck et al. ^[17]）

Figure 6. Th/Sc⁃Zr/Sc diagram of the black rock series from the Mufushan Formation in the Mufushan section ( base map after Lambeck et al. ^[17])

Fig.6

下载: 全尺寸图片幻灯片

图 7 幕府山剖面幕府山组黑色岩系稀土元素球粒陨石标准化配分模式（球粒陨石数据据杨学明^[19]）

Figure 7. The REE distribution patterns of the black rock series from the Mufushan Formation in the Mufushan section

Fig.7

下载: 全尺寸图片幻灯片

图 8 幕府山剖面幕府山组黑色岩系主量元素特征值分布图

Figure 8. The eigenvalue distribution schematics for the main elements of the black rock series from the Mufushan Formation in the Mufushan section

Fig.8

下载: 全尺寸图片幻灯片

图 9 幕府山剖面幕府山组黑色岩系物源性质判别图

Figure 9. Discrimination diagrams for the provenance attribute of the black rock series from the Mufushan Formation in the Mufushan section

Fig.9

下载: 全尺寸图片幻灯片

图 10 幕府山剖面幕府山组黑色岩系主量元素构造背景判别图

Figure 10. Discrimination diagrams for the tectonic setting of the main elements in the black rock series from the Mufushan Formation in the Mufushan section

Fig.10

下载: 全尺寸图片幻灯片

图 11 幕府山地区幕府山组黑色岩系微量元素构造背景判别图（据Bhatia et al.^[32]）

Figure 11. Discrimination diagrams for the tectonic setting of the trace elements in the black rock series of the Mufushan Formation in the Mufushan section (base map after Bhatia et al.^[32])

Fig.11

下载: 全尺寸图片幻灯片

图 12 下扬子地区早寒武世构造背景示意图

Figure 12. Schematic diagram of the Early Cambrian tectonic background in the Lower Yangtze region

Fig.12

下载: 全尺寸图片幻灯片

表 1 幕府山剖面幕府山组黑色岩系主量元素测试及分析结果（wt.%）

注：Fe₂O₃ ^T表示以Fe₂O₃表示全铁含量。

Table 1

下载: 导出CSV

表 2 幕府山剖面幕府山组黑色岩系微量元素、稀土元素测试及分析结果（μg/g）

注：ΣREE=LREE+HREE；LREE=La+Ce+Pr+Nd+Sm+Eu；HREE=Gd+Tb+Dy+Ho+Er+Tm+Yb+Lu；δEu=Eu/Eu^*=Eu_N/(Sm_N×Gd_N)^1/2；N为球粒陨石标准化。

Table 2

下载: 导出CSV

参考文献(36)

[1]	张爱云. 海相黑色页岩建造地球化学与成矿意义[M]. 北京：科学出版社，1987：1-98. Zhang Aiyun. Geochemistry and metall-ogenic significance of marine black shale[M]. Beijing: Science Press, 1987: 1-98.
[2]	薛耀松，俞从流. 浙西、赣东北寒武系下统荷塘组岩石特征及沉积环境分析[J]. 地层学杂志，1979，3（4）：283-293. Xue Yaosong, Yu Congliu. Analysis of rock characteristics and sedimentary environment of the Hetang Formation in the Cambrian in the northwestern Zhejiang and eastern Jiangxi[J]. Acta Stratigraphica Sinica, 1979, 3(4): 283-293.
[3]	王浩，凌文黎，段瑞春，等. 扬子克拉通峡东地区新元古代—寒武纪黑色岩系Os同位素地球化学特征及其地质意义[J]. 地球科学——中国地质大学学报，2012，37（3）：451-462. Wang Hao, Ling Wenli, Duan Ruichun, et al. Os isotopic geochemistry of Neoproterozoic-Cambrian black shales in eastern Three Gorges of Yangtze craton and its geological significance[J]. Earth Science-Journal of China University of Geosciences, 2012, 37(3): 451-462.
[4]	邓义楠，郭庆军，朱茂炎，等. 湘西寒武纪早期黑色岩系中干酪根的稀土元素地球化学特征[J]. 地球科学——中国地质大学学报，2014，39（3）：283-292. Deng Yi′nan, Guo Qingjun, Zhu Maoyan, et al. REE geochemistry of kerogen from Early Cambrian black rock series in western Hunan[J]. Earth Science-Journal of China University of Geosciences, 2014, 39(3): 283-292.
[5]	曹婷婷，徐思煌，王约. 川东北下寒武统筇竹寺组稀土元素特征及其地质意义：以南江杨坝剖面为例[J]. 石油实验地质，2018，40（5）：716-723. Cao Tingting, Xu Sihuang, Wang Yue. Characteristics of rare earth elements in Lower Cambrian Qiongzhusi Formation in northeastern Sichuan Basin and its geological implications: A case study of Yangba section, Nanjiang[J]. Petroleum Geology and Experiment, 2018, 40(5): 716-723.
[6]	陈孝红，危凯，张保民，等. 湖北宜昌寒武系水井沱组页岩气藏主控地质因素和富集模式[J]. 中国地质，2018，45（2）：207-226. Chen Xiaohong, Wei Kai, Zhang Baomin, et al. Main geological factors controlling shale gas reservior in the Cambrian Shuijingtuo Formation in Yichang of Hubei province as well as its and enrichment patterns[J]. Chinese Geology, 2018, 45(2): 207-226.
[7]	贾智彬，侯读杰，孙德强，等. 贵州地区牛蹄塘组底部烃源岩地球化学特征[J]. 天然气地球科学，2018，29（7）：1031-1041. Jia Zhibin, Hou Dujie, Sun Deqiang, et al. Geochemical characteristics of source rocks in the Lower Cambrian Niutitang Formation, Guizhou province[J]. Natural Gas Geoscience, 2018, 29(7): 1031-1041.
[8]	钱建民，刘崇民，杜红东，等. 浙江省下寒武统荷塘组黑色页岩系地球化学特征[J]. 物探与化探，2009，33（4）：395-399. Qian Jianmin, Liu Chongmin, Du Hongdong, et al. Geochemical characteristics of black shales in Lower Cambrian Hetang Formation, Zhejiang province[J]. Geophysical and Geochemical Exploration, 2009, 33(4): 395-399.
[9]	周磊，王宗秀，李会军，等. 川东—武陵山地区下寒武统牛蹄塘组页岩有机质富集模式[J]. 地质力学学报，2018，24（5）：617-626. Zhou Lei, Wang Zongxiu, Li Huijun, et al. Accumulation pattern of organic matter in shales of the Lower Cambrian Niutitang Formation, Chuandong-Wulingshan area[J]. Journal of Geomechanics, 2018, 24(5): 617-626.
[10]	刘小平，潘继平，董清源，等. 苏北地区古生界页岩气形成地质条件[J]. 天然气地球科学，2011，22（6）：1100-1108. Liu Xiaoping, Pan Jiping, Dong Qingyuan, et al. Geological conditions of shale gas forming in Paleozoic Subei area[J]. Natural Gas Geoscience, 2011, 22(6): 1100-1108.
[11]	许红，张柏林，俞昊，等. 下扬子地块2个古生界地质剖面的烃源岩特征及其对南黄海盆地的意义[J]. 海洋地质前沿，2015，31（4）：28-34. Xu Hong, Zhang Bolin, Yu Hao, et al. Characteristics of the source rocks from two Paleozoic geological sections in the Lower Yangtze and the implication for the South Yellow Sea Basin[J]. Marine Geology Frontiers, 2015, 31(4): 28-34.
[12]	刘小平，潘继平，刘东鹰，等. 苏北地区下寒武统幕府山组页岩气勘探前景[J]. 成都理工大学学报（自然科学版），2012，39（2）：198-205. Liu Xiaoping, Pan Jiping, Liu Dongying, et al. Shale-gas exploration prospect of Lower Cambrian Mufushan Formation in the northern Jiangsu, China[J]. Journal of Chengdu University of Technology (Science & Technology Edition), 2012, 39(2): 198-205.
[13]	Taylor S R, McLennan S M. The continental crust: Its composition and evolution[M]. Oxford: Blackwell Scientific Pub., 1985: 1-90.
[14]	Nesbitt H W, Young G M. Early Proterozoic climates and plate motions inferred from major element chemistry of lutites[J]. Nature, 1982, 299(5885): 715-717.
[15]	McLennan S M. Weathering and global denudation[J]. The Journal of Geology, 1993, 101(2): 295-303.
[16]	McLennan S M, Hemming S R, Taylor S R, et al. Early Proterozoic crustal evolution: Geochemical and Nd-Pb isotopic evidence from metasedimentary rocks, southwestern North America[J]. Geochimica et Cosmochimica Acta, 1995, 59(6):1153-1177.
[17]	Lambeck A, Huston D, Maidment D, et al. Sedimentary geochemistry, geochronology and sequence stratigraphy as tools to typecast stratigraphic units and constrain basin evolution in the gold mineralised Palaeoproterozoic Tanami region, northern Australia[J]. Precambrian Research, 2008, 166(1/2/3/4): 185-203.
[18]	McLennan S M. Rare earth elements in sedimentary rocks: Influence of provenance and sedimentary processes[J]. Reviews in Mineralogy and Geochemistry, 1989, 21(8): 169-200.
[19]	Rollinson H R. 岩石地球化学[M]. 杨学明，杨晓勇，陈双喜，译. 合肥：中国科学技术大学出版社，2000. Rollinson H R. Petrogeochemistry[M]. Yang Xueming, Yang Xiaoyong, Chen Shuangxi, trans. Hefei: China University of Science and Technology Press, 2000.
[20]	Allègre C J, Minster J F. Quantitative models of trace element behavior in magmatic processes[J]. Earth and Planetary Science Letters, 1978, 38(1): 1-25.
[21]	Floyd P A, Leveridge B E. Tectonic environment of the Devonian Gramscatho Basin, South Cornwall: Framework mode and geochemical evidence from turbiditic sandstones[J]. Journal of the Geological Society, 1987, 144(4): 531-542.
[22]	徐政语，蒋恕，熊绍云，等. 扬子陆块下古生界页岩发育特征与沉积模式[J]. 沉积学报，2015，33（1）：21-35. Xu Zhengyu, Jiang Shu, Xiong Shaoyun, et al. Characteristics and depositional model of the Lower Paleozoic organic rich shale in the Yangtze continental block[J]. Acta Sedimentologica Sinica, 2015, 33(1): 21-35.
[23]	舒良树. 华南构造演化的基本特征[J]. 地质通报，2012，31（7）：1035-1053. Shu Liangshu. An analysis of principal features of tectonic evolution in South China Block[J]. Geological Bulletin of China, 2012, 31(7): 1035-1053.
[24]	张国伟，郭安林，王岳军，等. 中国华南大陆构造与问题[J]. 中国科学（D辑）：地球科学，2013，43（10）：1553-1582. Zhang Guowei, Guo Anlin, Wang Yuejun, et al. Tectonics of South China continent and its implications[J]. Science China （Seri.D):Earth Sciences, 2013, 43(10): 1553-1582.
[25]	李秀珍，余何，江楠，等. 江南古陆研究成果综述禄丰[J]. 云南地质，2016，35（1）：1-4. Li Xiuzhen, Yu He, Jiang Nan, et al. A summary of the study result of Jiangnan old land[J]. Yunnan Geology, 2016, 35(1): 1-4.
[26]	黄汲清. 中国东部大地构造分区及其特点的新认识[J]. 地质学报，1959，39（2）：3-22. Huang Jiqing. New researches on geotectonic subdivisions of eastern China and their characteristics[J]. Acta Geologica Sinica, 1959, 39(2): 3-22.
[27]	任纪舜. 论中国南部的大地构造[J]. 地质学报，1990（4）：275-288. Ren Jishun. On the geotectonics of southern China[J]. Acta Geologica Sinica, 1990(4): 275-288.
[28]	高林志，刘燕学，丁孝忠，等. 江南古陆中段沧水铺群锆石U-Pb年龄和构造演化意义[J]. 中国地质，2012，39（1）：12-20. Gao Linzhi, Liu Yanxue, Ding Xiaozhong, et al. SHRIMP dating of Cangshuipu Group in the middle part of the Jiangnan Orogen and its implications for tectonic evolutions[J]. Geology in China, 2012, 39(1): 12-20.
[29]	赵振华. 铕地球化学特征的控制因素[J]. 南京大学学报（地球科学版），1993（5）：271-280. Zhao Zhenhua. Control factors of Eu geochemical characteristics[J]. Journal of Nanjing University-Earth Sciences, 1993(5): 271-280.
[30]	Roser B P, Korsch R J. Determination of tectonic setting of sandstone-mudstone suites using SiO2 content and K2O/Na2O ratio[J]. The Journal of Geology, 1986, 94(5): 635-650.
[31]	McLennan S M, Hemming S, Mcdaniel D K, et al. Geochemical approaches to sedimentation, provenance, and tectonics[J]. Special Paper of the Geological Society of America, 1993, 284: 21-40.
[32]	Bhatia M R, Crook K A. Trace element characteristics of graywackes and tectonic setting discrimination of sedimentary basins[J]. Contributions to Mineralogy and Petrology, 1986, 92(2): 181-193.
[33]	孙晶，王建强，龚建明. 下扬子陆域海相中—古生界烃源岩有机质丰度特征及其岩相古地理[J]. 海洋地质前沿，2016，32（1）：22-28. Sun Jing, Wang Jianqiang, Gong Jianming. Abundance of organic matters in Mesozoic-Paleozoic marine source rocks of inland area of the Lower Yangtze and its bearing on lithofacies paleogeography[J]. Marine Geology Frontiers, 2016, 32(1): 22-28.
[34]	印峰，杨风丽，叶芳，等. 晚震旦至中奥陶世下扬子被动大陆边缘原型盆地特征[J]. 地球科学——中国地质大学学报，2013，38（5）：1053-1064. Yin Feng, Yang Fengli, Ye Fang, et al. Late Sinian-Middle Ordovician the prototype basin characteristics of passive continental margin in Lower Yangtze[J]. Earth Science-Journal of China University of Geosciences, 2013, 38(5): 1053-1064.
[35]	徐文礼, 郑荣才, 颜雪, 等. 下扬子地区早古生代黑色岩系地球化学特征及其地质意义[J]. 吉林大学学报(地球科学版), 2014(4)：1108-1122. Xu Wenli, Zheng Rongcai, Yan Xue, et al. Trace and rare earthelement geochemistry of the Early Paleozoic black shales in the Lower Yangtze area and its geological significances[J]. Journal of Jilin University (Earth Sciences Edition), 2014, 44(4): 1108-1122.
[36]	于炳松, 陈建强, 李兴武, 等. 塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景[J]. 沉积学报, 2004, 22(1): 59-66. Yu Bingsong, Chen Jianqiang, Li Xingwu, et al. Rare earth and trace element patterns in bedded-cherts from the bottom of the Lower Cambrian in the northern Tarim Basin, Northwest China: Implication for depositional environments[J]. Acta Sedimentologica Sinica, 2004, 22(1): 59-66.