文章摘要信息

[an error occurred while processing this directive]

世界地质 2022, 41(4) 763-779 DOI: ISSN: 1004-5589 CN: 22-1111/P

本期目录 | 下期目录 | 过刊浏览 | 高级检索 [打印本页] [关闭]

基础地质

	扩展功能

	本文信息
	Supporting info
	PDF(1375KB)
	[HTML全文]
	参考文献[PDF]
	参考文献
	服务与反馈
	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	引用本文
	Email Alert
	文章反馈
	浏览反馈信息
	本文关键词相关文章

	地球化学
	微量元素
	沉积环境
	构造背景
	呼图壁河组
	准噶尔盆地南缘
	本文作者相关文章
	田育功
	夏明哲
	刘云华
	夏昭德
	王硕
	张云飞
	高景晖
	PubMed
	Article by Tian Y
	Article by Xia M
	Article by Liu Y
	Article by Xia Z
	Article by Wang S
	Article by Zhang Y
	Article by Gao J

准噶尔盆地南缘下白垩统呼图壁河组沉积地层地球化学特征及其物源分析

田育功，夏明哲，刘云华，夏昭德，王硕，张云飞，高景晖

长安大学地球科学与资源学院，西安 710054

摘要：在野外调查和剖面测量的基础上，对采自准噶尔盆地南缘下白垩统呼图壁河组岩石样品进行了沉积岩石学、岩相学和地球化学研究，探讨了下白垩统呼图壁河组沉积及物源特征。结果表明: 研究区主要岩性由一套粒度较细的粉砂岩和泥岩组成，沉积构造以水平层理为主，反映湖泊相的沉积特征; 样品化学蚀变指数 ( CIA) 平均为 58. 72，表明物源区经历了弱风化作用; 成分变异指数 ( ICV) 平均为 1. 37，表明沉积物成分成熟度低，代表构造活动带内初次旋回的产物，物源区性质基本未受成岩作用的影响; 流纹岩岩屑、La / Sc 和 Th / Sc 比值以及 La / Th--w ( Hf) 和 w ( Ni) --w ( TiO2 ) 判别图指示呼图壁河组源岩来自于上地壳的长英质火山岩; 此外，安山岩岩屑的出现及 Th /Co 和 Th /Cr 的比值特征表明有少量中--基性源岩的存在; 清水河组碎屑锆石物源 U--Pb 年龄约束了呼图壁河组物源年龄主要集中分布在 472. 7 ～ 277. 7 Ma 之间，与邻区岩浆锆石年龄对比分析表明整体上其物源区以北天山为主。V / ( V + Ni) 、V /Cr、Ni /Co 及气候指数 “C”指示古沉积环境以富氧的氧化环境为主，间或有贫氧过渡相，古气候整体为干燥环境。地球化学特征及 La --Th --Sc、Th --Sc --Zr/10 和 Th --Co --Zr/10 判别图显示物源区主要为大陆弧构造背景。

关键词：地球化学微量元素沉积环境构造背景呼图壁河组准噶尔盆地南缘

Geochemical characteristics and provenance of Lower Cretaceous Hutubihe Formation in southern margin of Junggar Basin，NW China

TIAN Yugong，XIA Mingzhe，LIU Yunhua，XIA Zhaode，WANG Shuo，ZHANG Yunfei，GAO Jinghui

School of Earth Science and Ｒesources，Chang'an University，Xi'an 710054，China

Abstract: Sedimentary petrology，petrography and geochemistry of rock samples from the Lower Cretaceous Hutubihe Formation in the southern margin of Junggar Basin were studied on the basis of field investigation and profile measurement． Sedimentary and provenance characteristics of the Lower Cretaceous Hutubihe Formation were discussed． The results show that the main lithology in the study area is composed of a set of fine siltstone and udstone，and the sedimentary structure is mainly horizontal bedding，reflecting the sedimentary characteristics of lacustrine facies． The chemical index of alteration ( CIA) mean value of the samples is 58. 72，indicating that the provenance experienced weak weathering． The index of compositional variability ( ICV) mean value of the samples is 1. 37，indicating that the sediment composition maturity is low，and the samples represent the product of the first cycle in the tectonic activity zone，whose source area is basically not affected by diagenesis．Ｒhyolite debris，La / Sc and Th / Sc ratios，and La /Th --w ( Hf) and w ( Ni) --w ( TiO2 ) discrimination diagrams indicate that the source rocks of the Hutubihe Formation are from the felsic volcanic rocks in the upper crust． In addition，the occurrence of andesite debris and the ratio characteristics of Th /Co and Th /Cr indicate the existence of a small amount of intermediate-basic source rocks． The U--Pb age of the detrital zircon from the Qingshuihe Formation restricts that the provenance age of the Hutubihe Formation is mainly distributed between 472. 7 and 277. 7 Ma． The comparison with the magmatic zircon ages of the adjacent area shows that the provenance is mainly from the North Tianshan． V / ( V + Ni) ，V /Cr，Ni /Co and climate index‘C’indicate that the sedimentary environment is dominated by oxygenrich oxidation environment，and there may be an oxygen-poor transition phase，and the paleoclimate is dry． Geochemical characteristics and La--Th--Sc，Th--Sc--Zr /10 and Th--Co--Zr /10 discriminant diagrams show that the provenance is mainly in a continental arc tectonic background．

Keywords: geochemistry trace elements sedimentary environment tectonic background Hutubihe Formation southern margin of Junggar Basin

收稿日期 修回日期 网络版发布日期

DOI:

基金项目:

通讯作者:

作者简介:

作者Email:

参考文献：

本刊中的类似文章

1．王晓亮，陈军典,程识,吴文彬,李超,刘永俊,李海洋,王玉平,吕行. 辽东半岛金家岭花岗岩体 LA--ICP--MS 锆石 U--Pb 年代学、地球化学特征及地质意义[J]. 世界地质, 2023,42(1): 11-25

2．方旭庆,曲希玉,刘英男，苗长盛. 东营北带盐家—永安地区沙四上亚段物源区构造背景及其储层差异性[J]. 世界地质, 2023,42(1): 80-91

3．贾培蒙,林鹤鸣,刘培,邱欣卫,沈梦蓉，郝国丽,徐川. 珠江口盆地恩平 13--14 洼文昌期构造转换及其对沉积充填的控制作用[J]. 世界地质, 2023,42(1): 92-103