渝北温泉镇地区三叠系“绿豆岩”特征及其地质意义

doi:10.19657/j.geoscience.1000-8527.2020.018

现代地质 ›› 2020, Vol. 34 ›› Issue (03): 431-449.DOI: 10.19657/j.geoscience.1000-8527.2020.018

渝北温泉镇地区三叠系“绿豆岩”特征及其地质意义

鞠鹏程¹^,²(), 王训练¹, 王振涛²(), 刘喜方², 仲佳爱²^,³, 张在明¹^,²

1.中国地质大学(北京) 地球科学与资源学院,北京 100083
2.中国地质科学院矿产资源研究所自然资源部盐湖资源与环境重点实验室,北京 100037
3.四川省地质矿产勘查开发局 405地质队,四川都江堰 611830

收稿日期:2019-06-12 修回日期:2019-12-30 出版日期:2020-07-04 发布日期:2020-07-05
通讯作者: 王振涛
作者简介:王振涛,男,博士,博士后,副研究员,1986年出生,古生物学与地层学专业,主要从事沉积学与大地构造研究工作。Email: wangz@cags.ac.cn。
鞠鹏程,男,硕士研究生,1994年出生,古生物学与地层学专业,主要从事综合地层学与生物地球化学方面的研究工作。Email: jpc1994@163.com。
基金资助:
国家重点研发计划项目“重点盐矿锂能源金属矿产基地深部探测技术示范”(2017YFC0602704)

Characteristics and Geological Significance of the Triassic Mungbean Rocks in the Wenquan Town Area, Northern Chongqing

JU Pengcheng¹^,²(), WANG Xunlian¹, WANG Zhentao²(), LIU Xifang², ZHONG Jiaai²^,³, ZHANG Zaiming¹^,²

1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2. MNR Key Laboratory of Saline Lake Resources and Environments, CAGS, Beijing 100037, China
3. No. 405 Geological Party, Sichuan Bureau of Geology and Mineral Exploration and Development, Dujiangyan, Sichuan 611830, China

Received:2019-06-12 Revised:2019-12-30 Online:2020-07-04 Published:2020-07-05
Contact: WANG Zhentao

摘要/Abstract

摘要：

华南地区三叠系广泛分布蚀变火山灰(俗称“绿豆岩”)。对渝北温泉镇地区平洪村剖面与谢家槽剖面的“绿豆岩”进行矿物学、全岩地球化学和锆石U-Pb测年及地球化学分析。X射线衍射分析表明,矿物组成均以石英和碱性长石为主,此外还含有伊利石、蒙脱石等黏土矿物。锆石岩相学、Th/U比值及锆石REE配分模式都显示典型的岩浆成因锆石特征,但样品和锆石的地球化学特征明显不同。锆石U-Pb测年结果揭示平洪村样品的形成年龄为(247.2±0.59) Ma(MSWD=2.3,n=30),与早、中三叠世的界线年龄(247.2 Ma)高度吻合,其锆石地球化学特征显示板内成因,推测是在峨眉山大火成岩省主要活动期之后板内火山活动过程中形成的。谢家槽剖面样品年龄为(225.9±1.4) Ma(MSWD=1.6,n=29),锆石地球化学特征显示岩浆弧成因,结合区域地质演化特征分析,特别是研究区北部(华北南缘)同时期火山灰的发现,认为谢家槽剖面“绿豆岩”很可能是勉略洋闭合过程中的产物。

关键词: 四川盆地, 绿豆岩, 三叠纪, 锆石U-Pb定年, 物源

Abstract:

Altered Triassic volcanic ash beds are widely distributed in South China, and is locally called “mungbean rocks”. In the Pinghongcun and Xiejiacao sections in the Wenquan town (northern Chongqing), these “mungbean rocks” were sampled and X-ray diffraction (XRD) analyzed. Our results show these rocks contain mainly quartz and alkali feldspars, together with clay minerals such as illite and montmorillonite.Zircon morphology, Th/U ratio and zircon REE patterns indicate typical magmatic zircon features. However, geological interpretations yielded from zircon geochemistry of different samples are markedly different. Zircon U-Pb dating reveals that the Pinghongcun sample was formed at (247.2±0.59) Ma (MSWD=2.3, n =30), coeval with the T₁/T₂ boundary (247.2 Ma). The zircon geochemical characteristics indicate an intraplate origin, presumably resulted from the intraplate volcanism after the main-stage Emeishan large igneous province (LIP) activity. The Xiejiacao sample was formed at (225.9±1.4) Ma (MSWD=7.1, n=29), and the zircon geochemistry points to a magmatic arc origin. Combined with regional geology, especially the discovery of the coeval volcanic ash beds to the north (southern margin of North China Block) ,we inferred that the Xiejiacao sample was probably the product of the Mian-Lue Ocean closure.

Key words: Sichuan Basin, mungbean rock, Triassic, zircon U-Pb dating, provenance

中图分类号:

鞠鹏程, 王训练, 王振涛, 刘喜方, 仲佳爱, 张在明. 渝北温泉镇地区三叠系“绿豆岩”特征及其地质意义[J]. 现代地质, 2020, 34(03): 431-449.

JU Pengcheng, WANG Xunlian, WANG Zhentao, LIU Xifang, ZHONG Jiaai, ZHANG Zaiming. Characteristics and Geological Significance of the Triassic Mungbean Rocks in the Wenquan Town Area, Northern Chongqing[J]. Geoscience, 2020, 34(03): 431-449.

图/表 14

图1 四川盆地及周缘区域构造概况[34](a)和研究区地质图[35](b)

Fig.1 Tectonic map of Sichuan Basin and its surrounding areas[34] (a), and the geological map of the study area[35] (b)

图2 平洪村剖面和谢家槽剖面露头照片及地层柱状图平洪村剖面:(a)“绿豆岩”沉积;(b)下伏岩溶角砾岩。谢家槽剖面:(c)“绿豆岩”沉积;(d)下伏地层。(e)地层柱状图

Fig.2 Outcrop photos and stratigraphic columns of Pinghongcun and Xiejiacao sections

图3 平洪村样品PHC-2-R-1和谢家槽样品XJC-1-R-1显微镜下照片 (a)PHC-2-R-1单偏光镜下照片;(b)XJC-1-R-1单偏光镜下照片;(c)PHC-2-R-1正交光镜下照片,晶屑凝灰岩;(d)XJC-1-R-1正交光镜下照片,玻屑凝灰岩,蚀变明显且无大颗粒

Fig.3 Photomicrographs of samples of PHC-2-R-1 from Pinghongcun and XJC-1-R-1 from Xiejiacao

图4 平洪村剖面“绿豆岩”PHC-1-R-1样品(a)和谢家槽剖面“绿豆岩”XJC-1-R-1样品(b)XRD谱图

Fig.4 XRD spectra for samples of PHC-1-R-1(a) and XJC-1-R-1(b)

表1 渝北温泉镇地区“绿豆岩”样品的主量元素分析结果(%)

Table 1 Analysis results of major elements of mungbean rock samples in the Wenquan Town, northern Chongqing(%)

样品号	SiO₂	Al₂O₃	MgO	Na₂O	K₂O	P₂O₅	TiO₂	CaO	TFe₂O₃	MnO	烧失量	总量
PHC-2-R-1	56.56	9.85	8.01	0.08	6.45	0.10	0.23	6.81	1.41	0.01	11.66	101.17
XJC-1-R-1	66.96	14.18	3.84	0.06	11.04	0.05	0.23	0.37	0.60	0.01	3.36	100.96

表2 渝北温泉镇地区“绿豆岩”样品中微量、稀土元素含量(10-6)

Table 2 Contents of trace elements and REE of mungbean rock samples from the Wenquan Town, northern Chongqing(10-6)

样品号	Li		Be		Sc		Ti		V		Cr		Mn		Co		Ni		Cu		Zn		Ga
PHC-2-R-1	244.242		3.018		4.137		1 412.657		20.676		11.960		52.123		2.363		5.154		9.136		9.031		13.440
XJC-1-R-1	380.015		4.268		3.373		1 395.092		11.160		3.009		57.954		1.380		1.870		4.084		2.639		17.384
样品号	Ge		As		Rb		Sr		Y		Zr		Nb		Mo		Cd		In		Sn		Sb
PHC-2-R-1	1.585		10.831		43.274		86.299		29.318		101.726		8.772		0.124		0.011		0.056		10.762		0.685
XJC-1-R-1	2.135		6.491		140.523		101.139		23.174		137.673		11.942		0.218		0.002		0.050		8.596		0.526
样品号	Cs		Ba		Hf		Ta		W		Tl		Pb		Bi		Th		U		La		Ce
PHC-2-R-1	2.043		77.542		3.687		0.916		2.470		0.337		8.468		0.683		17.372		5.393		27.256		52.157
XJC-1-R-1	1.964		95.043		5.428		1.332		2.296		0.335		2.857		0.996		30.998		5.736		45.599		99.297
样品号	Pr	Nd		Sm		Eu		Gd		Tb		Dy		Ho		Er		Tm		Yb		Lu	∑REE
PHC-2-R-1	6.387	24.812		5.474		0.355		4.994		0.894		5.660		1.050		3.417		0.472		2.995		0.435	136.357
XJC-1-R-1	11.286	40.372		6.312		0.280		3.752		0.696		4.506		0.819		2.555		0.373		2.349		0.348	218.545

图5 渝北温泉镇地区“绿豆岩”样品微量元素原始地幔标准化蛛网图(标准化值据文献[38])

Fig.5 Primitive mantle-normalized spider diagram of the mungbean rock samples from the Wenquan Town, northern Chongqing (Standardized values after reference[38])

表3 样品锆石中微量、稀土元素含量(10-6)

Table 3 Contents of trace and rare earth elements of zircons in samples( 10 -6 )

图6 渝北温泉镇地区“绿豆岩”样品全岩(a)和锆石(b)稀土元素球粒陨石配分图(标准化值据文献[38])

Fig.6 Chondrite-normalized REE patterns of the mungbean rock samples (a) and their zircons (b) in the Wenquan Town, northern Chongqing (standardized values after reference [38])

图7 渝北温泉镇地区“绿豆岩”样品锆石阴极发光图

Fig.7 Representative zircon CL images of the mungbean rock samples in the Wenquan Town, northern Chongqing

图8 “绿豆岩”样品PHC-2-R-1(a)和XJC-1-R-1(b)锆石U-Pb谐和图

Fig.8 LA-ICP-MS zircon U-Pb ages for samples of PHC-2-R-1(a) and XJC-1-R-1(b)

图9 渝北温泉镇地区“绿豆岩”样品微量元素岩性判别图解((a)据文献[61],(b)据文献[62])

Fig.9 Trace elements lithological discrimination diagrams of the mungbean rock samples from the Wenquan Town, northern Chongqing (base maps of (a) after reference [61], and (b) after reference [62])

图10 渝北温泉镇地区“绿豆岩”样品锆石Th/U与年龄关系(a)、Y-U/Yb图解[63](b)以及锆石Th/Nb-Hf/Th[64](c)和Th/U-Nb/Hf图解[64](d)

Fig.10 Diagrams of Th/U versus age (a), Y versus U/Yb[63] (b), Th/Nb versus Hf/Th[64] (c) and Th/U versus Nb/Hf(d) [64] of zircons in the mungbean rock samples from the Wenquan Town, northern Chongqing

图11 华南三叠纪中酸性岩浆岩与沉凝灰岩年龄分布(年龄据文献[33, 60, 95, 99-106])

Fig.11 Age distribution of Triassic intermediate-acid magmatic rocks and tuff layers in the South China (age data after references of [33, 60, 95, 99-106])

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渝北温泉镇地区三叠系“绿豆岩”特征及其地质意义

Characteristics and Geological Significance of the Triassic Mungbean Rocks in the Wenquan Town Area, Northern Chongqing

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