上扬子区西南部早寒武世梅树村期沉积环境演化及其对磷富集成矿的意义

doi:10.3799/dqkx.2026.004

上扬子区西南部早寒武世梅树村期沉积环境演化及其对磷富集成矿的意义

doi: 10.3799/dqkx.2026.004

何洪茜¹,
康逊¹,
李斌^1, ,,
门欣¹,
杨光亮²,
黄凯²

1. 有色金属成矿预测与地质环境监测教育部重点实验室，地球科学与信息物理学院，中南大学，湖南长沙 410083
2. 中化地质矿山总局贵州地质勘查院，贵州贵阳 55000

基金项目:

国家自然科学基金项目(No.42073001)

贵州省地质勘查专项资金项目(No.2024013)

详细信息

作者简介:
何洪茜（1997-），女，1997年出生，博士研究生，从事沉积矿产研究，E-mail:hehongxi9@163.com，ORCID：0009-0001-8935-8476。

通讯作者:
李斌（1985-)，男，博士，教授，从事矿床地球化学与同位素地球化学研究，E-mail: cutelb@csu.edu.cn。

中图分类号: P619
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出版历程
- 收稿日期: 2025-08-25
- 网络出版日期: 2026-01-28

Sedimentary environment evolution and phosphorus enrichment significance of the Early Cambrian Meishucunian in Southwestern Upper Yangtze

1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring（Ministry of Education）, School of Geosciences and Info-Physics, Central South University, Changsha 410083, Hunan, China
2. Guizhou Geological Prospecting Institute of China Chemical Geology and Mine Bureau, Guiyang 55000, Guizhou, China

摘要

摘要: 早寒武世梅树村期磷矿是埃迪卡拉纪-寒武纪转折期重要的成磷事件。研究寒武系梅树村组地层厚度分布、岩相时空变化及海水氧化还原状态，对该时期成磷机制研究具有重要意义。本文实测43条剖面并整理大量露头及钻井资料，开展岩矿学工作，划分岩相类型，结合微量元素地球化学指标，识别出沉积相并刻画了其时空分布特征，进而绘制了该时期岩相古地理图。梅树村期上扬子碳酸盐台地以潮坪沉积为主，相带展布受NNE向裂陷槽控制显著，槽内为潮间滩、潮下滩和潮下泥坪，槽外为潮上滩和云坪等微相。梅树村期早期Ce负异常更显著，Y/Ho值更高，Ni/Co-V/Cr及Mo_EF-U_EF结果均指示氧化水体环境。梅树村期上扬子台地裂陷槽内的潮间-潮下高能带是磷质聚集的有利场所；梅树村早期水体氧化程度较高，为磷矿形成提供了有利条件。裂陷槽内高能氧化环境利于厚层磷块岩发育，据此指出贵州毕节-云南镇雄、贵州威宁-云南鲁甸为潜在磷矿远景区。
- 古地貌 /
- 岩相古地理 /
- 氧化还原条件 /
- 磷矿 /
- 梅树村组 /
- 上扬子区西南部
Abstract: The phosphogenic event during the Meishucunian Age of the early Cambrian represents a significant phosphate mineralization episode in the Ediacaran-Cambrian transition.Investigating the stratigraphic thickness distribution, spatiotemporal lithofacies variations, and seawater redox conditions of the Cambrian Meishucun Formation is of great significance for understanding phosphogenesis mechanisms during this period.Based on 43 measured sections and a large amount of compiled outcrop and drilling data, this study classified lithofacies types and utilized geochemical proxies (e.g., trace elements) to identify sedimentary facies and characterize their spatiotemporal distribution. Two lithofacies-paleogeographic maps of the Meishucunian age were subsequently reconstructed. The facies distribution of the Meishucunian carbonate platform (Yangtze Block) was controlled by a NNE-oriented rift trough, leading to subtidal-intertidal shoals and mudflats within the trough and supratidal flats outside it. The early Meishucunian stage exhibited more pronounced negative Ce anomalies, higher Y/Ho ratios, and Ni/Co-V/Cr and Mo_EF-U_EF proxy values collectively indicative of oxidizing conditions. The high-energy tidal flat environment in the study area during the Meishucunian stage facilitated phosphorus enrichment, with intertidal-subtidal high-energy zones predominantly distributed within the rift trough. The highly oxidizing water conditions in the early Meishucunian stage provided a favorable setting for phosphorite formation. The high-energy oxidizing environment within the rift trough facilitated the development of thick phosphorite layers, leading to the identification of two potential prospecting targets: Bijie (Guizhou)-Zhenxiong (Yunnan) and Weining (Guizhou)-Ludian (Yunnan).
- Paleotopography /
- Lithofacies Paleogeography /
- Redox Conditions /
- Phosphorite /
- Meishucun Formation /
- Southwestern Upper Yangtze

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上扬子区西南部早寒武世梅树村期沉积环境演化及其对磷富集成矿的意义

doi: 10.3799/dqkx.2026.004

作者简介:
何洪茜（1997-），女，1997年出生，博士研究生，从事沉积矿产研究，E-mail:hehongxi9@163.com，ORCID：0009-0001-8935-8476。

通讯作者:
李斌（1985-)，男，博士，教授，从事矿床地球化学与同位素地球化学研究，E-mail: cutelb@csu.edu.cn。

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Sedimentary environment evolution and phosphorus enrichment significance of the Early Cambrian Meishucunian in Southwestern Upper Yangtze

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留言板

上扬子区西南部早寒武世梅树村期沉积环境演化及其对磷富集成矿的意义

doi: 10.3799/dqkx.2026.004

作者简介: 何洪茜（1997-），女，1997年出生，博士研究生，从事沉积矿产研究，E-mail:hehongxi9@163.com，ORCID：0009-0001-8935-8476。

通讯作者: 李斌（1985-)，男，博士，教授，从事矿床地球化学与同位素地球化学研究，E-mail: cutelb@csu.edu.cn。

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出版历程

Sedimentary environment evolution and phosphorus enrichment significance of the Early Cambrian Meishucunian in Southwestern Upper Yangtze

计量

出版历程

目录

作者简介:
何洪茜（1997-），女，1997年出生，博士研究生，从事沉积矿产研究，E-mail:hehongxi9@163.com，ORCID：0009-0001-8935-8476。

通讯作者:
李斌（1985-)，男，博士，教授，从事矿床地球化学与同位素地球化学研究，E-mail: cutelb@csu.edu.cn。