东昆仑三通沟北锰矿床沉积相与沉积环境<sup>&#x0002A;</sup>

doi:10.7605/gdlxb.2023.03.093

古地理学报 ›› 2023, Vol. 25 ›› Issue (3): 671-683. doi: 10.7605/gdlxb.2023.03.093

东昆仑三通沟北锰矿床沉积相与沉积环境^*

刘永乐¹, 李文^2,3, 赵静纯¹, 李有禄¹, 夏有河¹, 张大明¹, 董志国², 李文君², 张连昌²

1 青海省第三地质勘查院,青海西宁 810029;
2 中国科学院地质与地球物理研究所,北京 100029;
3 中国地质大学(北京)地球科学与资源学院,北京 100083

收稿日期:2022-10-21 修回日期:2022-12-11 出版日期:2023-06-01 发布日期:2023-06-07
通讯作者: 张连昌,男,1959年生,研究员,主要从事地质教学和科学研究。E-mail: lczhang@mail.iggcas.ac.cn。
作者简介:刘永乐,男,1985年生,高级工程师,从事矿床地质研究及矿产勘查工作。E-mail: 281023605@qq.com。
基金资助:
*青地三勘(2022)14号、青自然资源(2021)114号和国家自然科学基金项目(编号: 92062217)等项目共同资助

Sedimentary facies and depositional environment of Santonggoubei manganese deposit in eastern Kunlun of Qinghai Province

LIU Yongle¹, LI Wen^2,3, ZHAO Jingchun¹, LI Youlu¹, XIA Youhe¹, ZHANG Daming¹, DONG Zhiguo², LI Wenjun², ZHANG Lianchang²

1 The Third Institute of Qinghai Geological Prospecting,Xining 810029,China;
2 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;
3 School of Earth Sciences and Resources, China University of Geosciences(Beijing),Beijing 100083,China

Received:2022-10-21 Revised:2022-12-11 Online:2023-06-01 Published:2023-06-07
Contact: ZHANG Lianchang,born in 1959,is a professor. He is mainly engaged in geological teaching and scientific research. E-mail: lczhang@mail.iggcas.ac.cn.
About author:LIU Yongle,born in 1985,is a senior engineer. He is mainly engaged in ore deposit geology and mineral exploration. E-mail: 281023605@qq.com.
Supported by:
Co-funded by the Third Institute of Qinghai Geological Prospecting(2022)No.14,Qinghai Natural Resources(2021)No.114 and the National Natural Science Foundation of China(No. 92062217)

摘要/Abstract

摘要： 青海省三通沟北锰矿床是近年在东昆仑南部构造带上新发现的沉积型锰矿。初步研究表明,该锰矿赋存于奥陶—志留系纳赤台群硅质岩和细碎屑岩地层中,但目前该矿床研究程度较低,有关锰矿沉积相和沉积环境尚缺乏深入研究。在区域和矿床地质考察的基础上,通过典型地质剖面测量、室内镜下薄片鉴定和地球化学分析等研究工作,认为三通沟北锰矿形成于被动大陆边缘环境; 矿区Ⅰ-Ⅲ主矿带形成于南部的深水盆地相,其岩性主要为硅质岩、硅质泥岩、碳质泥岩,夹泥质粉砂岩,其上与斜坡相砂岩和陆棚相砂岩—粉砂岩接触; 矿区北部的Ⅳ-Ⅴ矿化带分布于陆棚相带中的局限洼地,岩性主要为泥质粉砂岩、硅质泥岩及硅质岩,含锰岩系顶板为陆棚相粉砂岩、细砂岩及碳酸盐相沉积。总体看,三通沟北锰矿形成于海相陆棚洼地和深水盆地的古地理环境。地球化学分析表明,三通沟北锰矿主矿带的形成与盆地相幕式富氧过程关系密切; 锰矿的沉淀机制与通过斜坡相的密度流将浅部含氧水体幕式灌入到(近边缘)深水盆地的过程有关。

关键词: 沉积相, 沉积环境, 沉积锰矿, 纳赤台群, 三通沟, 东昆仑, 青海省

Abstract: The Santonggoubei manganese deposit is a recently found marine sedimentary manganese deposit in south tectonic zone of the eastern Kunlun orogen. Preliminary studies indicate that this manganese deposit is hosted in siliceous and fine-grained clastic rocks of the Ordovician-Silurian Nachitai Group. To date,the Santonggoubei deposit is only moderately studied with respect to sedimentary facies and depositional environment. Based on field investigations of regional geology and deposit geology,combined with sedimentological measurement of outcrop sections,petrographic observations and geochemical analysis,the authors suggest that the Santonggoubei manganese deposit formed on a passive continental margin. The main ore belts(from Ⅰ to Ⅲ)formed in the marginal facies of the southern deep-water basin,which was characterized by siliceous rocks,siliceous mudstone,and carbonaceous mudstone,intercalated with argillaceous siltstone;the marginal facies was in contact with slope sandstone and shelf sandstone-siltstone. The Ⅳ-Ⅴ mineralization belt was distributed in the restricted depression of the shelf facies,which was characterized by argillaceous siltstone,siliceous mudstone,and siliceous rocks. The Mn ore-bearing succession was overlain by shelf siltstone-fine sandstone and carbonate rocks. Overall,the palaeogeographic environments of the Santonggoubei manganese deposit were marine shelf depression and the margin of the deep-water basin. Geochemical analysis demonstrates that the formation of the main ore belt was closely related to the oxic-rich conditions of the basin waters. The precipitation mechanism of manganese is related to the episodic intrusions of shallow,oxygen-rich waters into the edge of deep-water basin.

Key words: sedimentary facies, sedimentary environment, sedimentary manganese deposit, Nachitai Group, Santonggou, eastern Kunlun, Qinghai Province

中图分类号:

P588.24+3

刘永乐, 李文, 赵静纯, 李有禄, 夏有河, 张大明, 董志国, 李文君, 张连昌. 东昆仑三通沟北锰矿床沉积相与沉积环境^*[J]. 古地理学报, 2023, 25(3): 671-683.

LIU Yongle, LI Wen, ZHAO Jingchun, LI Youlu, XIA Youhe, ZHANG Daming, DONG Zhiguo, LI Wenjun, ZHANG Lianchang. Sedimentary facies and depositional environment of Santonggoubei manganese deposit in eastern Kunlun of Qinghai Province[J]. JOPC, 2023, 25(3): 671-683.

http://www.gdlxb.cn/CN/Y2023/V25/I3/671

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东昆仑三通沟北锰矿床沉积相与沉积环境*

Sedimentary facies and depositional environment of Santonggoubei manganese deposit in eastern Kunlun of Qinghai Province

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东昆仑三通沟北锰矿床沉积相与沉积环境^*