桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

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桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

常华进

文章导航 > 沉积学报 > 2010 > 28(6): 1098-1107

常华进. 桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示[J]. 沉积学报, 2010, 28(6): 1098-1107.

引用本文:

常华进. 桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示[J]. 沉积学报, 2010, 28(6): 1098-1107.

CHANG Huajin. The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province[J]. Acta Sedimentologica Sinica, 2010, 28(6): 1098-1107.

Citation:

CHANG Huajin. The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province[J]. Acta Sedimentologica Sinica, 2010, 28(6): 1098-1107.

常华进. 桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示[J]. 沉积学报, 2010, 28(6): 1098-1107.

引用本文:

常华进. 桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示[J]. 沉积学报, 2010, 28(6): 1098-1107.

CHANG Huajin. The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province[J]. Acta Sedimentologica Sinica, 2010, 28(6): 1098-1107.

Citation:

CHANG Huajin. The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province[J]. Acta Sedimentologica Sinica, 2010, 28(6): 1098-1107.

桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

常华进

青海师范大学生命与地理科学学院西宁810008

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常华进

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The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province

CHANG Huajin

School of Life and Geography Sciences, Qinghai Normal University, Xining 810008

More Information

Corresponding author: CHANG Huajin

摘要

摘要: 桂北泗里口老堡组为一套埃迪卡拉纪—寒武纪过渡时期（大约550～540 Ma）深水盆地沉积的硅质岩。它们的SiO2含量普遍高（平均93.8%）；Al2O3含量为0.17%～4.92%，沿剖面自下而上明显增加，上部超过2%；Al/(Al+Fe+Mn)比值多高于0.42；Fe/Ti比值大都小于16.3；Al2O3/( Al2O3+Fe2O3)比值多高于0.4，剖面上部样品的比值为0.8～0.9；Y/Ho比值为26.4～36.9，中、下部样品较高（多高于32），上部样品的比值接近地壳值（27）；Eu/Eu*平均值为1.0，正异常不明显。剖面下部样品的∑REE含量低（15.9×10-6～27.1×10-6），具有与现代海水相近的REE配分，没有正的Eu异常，不同于海底的热液流体和与其有关的碧玉的REE配分；中部样品的∑REE含量为26.2×10-6～49.4×10-6，由于所含陆源碎屑的增加，REE配分变得平坦，但仍有海水REE的某些特征；上部样品的∑REE含量为40.5×10-6～59×10-6，显示与平均页岩相似的平坦的REE配分，但∑REE含量仅为平均页岩的大约1/4～1/3。这些常量和稀土元素特征表明，海底热液和陆源碎屑都不可能成为泗里口老堡组硅质岩的重要物源。埃迪卡拉纪—寒武纪过渡时期华南深水盆地厚层硅质岩沉积反映了这一时期大气高CO2浓度，大量陆源化学风化的硅质流入海洋和大量生物的降解可能是造成这些硅质岩形成的基本原因。
- 硅质岩 /
- 埃迪卡拉纪—寒武纪过渡时期 /
- 老堡组 /
- 元素 /
- 成因
Abstract: The Silikou chert in Northern Guangxi Province was deposited in a terminal Ediacaran to early Cambrian (about 550～540 Ma) deep ocean basin. It has high SiO2 concentration (average 93.8%). Al2O3 content ranges from 0.17% to 4.92% and increases from the lower to the upper section which is more than 2%. Al/(Al+Fe+Mn) and Fe/Ti ratios for most of the chert are more than 0.42 and less than 16.3, respectively. Al2O3/( Al2O3+Fe2O3) ratios for most of the chert exceeds 0.4 and the ratios are 0.8～0.9 for chert in the upper section. Y/Ho ratios (26.4～36.9) are high (more than 32) for chert in the lower and middle section, and are similar to that of the upper crust (27) for chert in the upper section. It has no positive Eu anomalies (average 1.0) for the chert samples. REE concentrations for chert in the lower section (15.9×106～27.1×106) are low relative to PAAS, which are similar to that of the seawater but hydrothermal fluids or jasper related to seafloorhydrothermal sulfide deposits. Although REE patterns for chert in the middle section become flat since the increase of terrigenous detrital input, they have low REE concentrations (26.2×106～49.4×106) and seawater characteristics. REE concentrations for chert in the upper section range from 40.5×106 to 59×106 and they have flat REE patterns that are similar to PAAS, yet REE concentrations are just 1/4～1/3 of the PAAS. The major and rare earth elements characteristics of the Silikou chert suggest hydrothermal fluids and terrigenous detrital input were not main sources of the silica. In fact, huge amounts of dissolved silica derived from chemical weathering due to high CO2 concentration in the atmosphere and degradation of organic matter were the basic cause for the basinal chert in South China. 
- chert /
- EdiacaranCambrian transition period /
- the Laobao Formation /
- element /
- petrogenesis

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[1]	黄少英, 章凤奇, 罗彩明, 段云江, 亢茜. 塔里木盆地西北缘埃迪卡拉纪熔积岩特征、成因及地质意义 . 沉积学报, 2024, (): -. doi: 10.14027/j.issn.1000-0550.2023.134
[2]	邹怡, 韦恒叶. 下扬子中二叠统孤峰组热液硅质岩地球化学约束及其意义 . 沉积学报, 2024, 42(3): 799-811. doi: 10.14027/j.issn.1000-0550.2024.019
[3]	路淑毅, 杨斌, 李胜荣, 宋香锁, 杜圣贤, 高建飞, 张尚坤, 李明慧, 张伟林. 鲁西南单县盆地钻孔记录的古近纪环境变化 . 沉积学报, 2023, 41(2): 498-510. doi: 10.14027/j.issn.1000-0550.2021.090
[4]	潘世乐, 蒋赟, 康健, 陈波, 张顺存, 孙国强. 柴北缘冷湖七号下干柴沟组上段古气候及物源分析 . 沉积学报, 2021, 39(5): 1292-1304. doi: 10.14027/j.issn.1000-0550.2021.013
[5]	徐锦龙, 沈仕豪, 汪雅菲, 汪方跃. 中二叠统热水沉积新证据——以皖南“嵇亭岭砾岩”为例 . 沉积学报, 2020, 38(2): 284-296. doi: 10.14027/j.issn.1000-0550.2019.041
[6]	吴超伟, 侯明才, 黄虎, 周倩玉, 罗宏谓. 滇东南麻栗坡中—下二叠统硅质岩地球化学特征及地质意义 . 沉积学报, 2020, 38(1): 196-204. doi: 10.14027/j.issn.1000-0550.2020.2019.001
[7]	杨程宇, 李美俊, 倪智勇, 杨福林, 陈昊卫. 塔里木盆地西北缘玉尔吐斯组硅质岩成因及石油地质意义 . 沉积学报, 2016, 34(4): 653-661. doi: 10.14027/j.cnki.cjxb.2016.04.005
[8]	刘浩, 徐大良, 牛志军, 彭练红, 魏运许, 赵小明. 湖北竹山杨家堡组硅质岩成因及沉积环境分析 . 沉积学报, 2015, 33(6): 1087-1096. doi: 10.14027/j.cnki.cjxb.2015.06.003
[9]	. 鄂西南利川二叠纪吴家坪组硅质岩成因及沉积环境 . 沉积学报, 2013, 31(04): 590-599.
[10]	. 滇东南丘北地区上二叠统吴家坪阶硅质岩地球化学特征及地质意义 . 沉积学报, 2013, 31(04): 621-629.
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桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

常华进

青海师范大学生命与地理科学学院西宁810008

通讯作者: 常华进

收稿日期: 1900-01-01
修回日期: 1900-01-01
刊出日期: 2010-12-10

关键词:

硅质岩 /

埃迪卡拉纪—寒武纪过渡时期 /

老堡组 /

元素 /

成因

摘要: 桂北泗里口老堡组为一套埃迪卡拉纪—寒武纪过渡时期（大约550～540 Ma）深水盆地沉积的硅质岩。它们的SiO2含量普遍高（平均93.8%）；Al2O3含量为0.17%～4.92%，沿剖面自下而上明显增加，上部超过2%；Al/(Al+Fe+Mn)比值多高于0.42；Fe/Ti比值大都小于16.3；Al2O3/( Al2O3+Fe2O3)比值多高于0.4，剖面上部样品的比值为0.8～0.9；Y/Ho比值为26.4～36.9，中、下部样品较高（多高于32），上部样品的比值接近地壳值（27）；Eu/Eu*平均值为1.0，正异常不明显。剖面下部样品的∑REE含量低（15.9×10-6～27.1×10-6），具有与现代海水相近的REE配分，没有正的Eu异常，不同于海底的热液流体和与其有关的碧玉的REE配分；中部样品的∑REE含量为26.2×10-6～49.4×10-6，由于所含陆源碎屑的增加，REE配分变得平坦，但仍有海水REE的某些特征；上部样品的∑REE含量为40.5×10-6～59×10-6，显示与平均页岩相似的平坦的REE配分，但∑REE含量仅为平均页岩的大约1/4～1/3。这些常量和稀土元素特征表明，海底热液和陆源碎屑都不可能成为泗里口老堡组硅质岩的重要物源。埃迪卡拉纪—寒武纪过渡时期华南深水盆地厚层硅质岩沉积反映了这一时期大气高CO2浓度，大量陆源化学风化的硅质流入海洋和大量生物的降解可能是造成这些硅质岩形成的基本原因。

English Abstract

The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province

CHANG Huajin

School of Life and Geography Sciences, Qinghai Normal University, Xining 810008

Corresponding author: CHANG Huajin

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2010-12-10

Keywords:

Abstract: The Silikou chert in Northern Guangxi Province was deposited in a terminal Ediacaran to early Cambrian (about 550～540 Ma) deep ocean basin. It has high SiO2 concentration (average 93.8%). Al2O3 content ranges from 0.17% to 4.92% and increases from the lower to the upper section which is more than 2%. Al/(Al+Fe+Mn) and Fe/Ti ratios for most of the chert are more than 0.42 and less than 16.3, respectively. Al2O3/( Al2O3+Fe2O3) ratios for most of the chert exceeds 0.4 and the ratios are 0.8～0.9 for chert in the upper section. Y/Ho ratios (26.4～36.9) are high (more than 32) for chert in the lower and middle section, and are similar to that of the upper crust (27) for chert in the upper section. It has no positive Eu anomalies (average 1.0) for the chert samples. REE concentrations for chert in the lower section (15.9×106～27.1×106) are low relative to PAAS, which are similar to that of the seawater but hydrothermal fluids or jasper related to seafloorhydrothermal sulfide deposits. Although REE patterns for chert in the middle section become flat since the increase of terrigenous detrital input, they have low REE concentrations (26.2×106～49.4×106) and seawater characteristics. REE concentrations for chert in the upper section range from 40.5×106 to 59×106 and they have flat REE patterns that are similar to PAAS, yet REE concentrations are just 1/4～1/3 of the PAAS. The major and rare earth elements characteristics of the Silikou chert suggest hydrothermal fluids and terrigenous detrital input were not main sources of the silica. In fact, huge amounts of dissolved silica derived from chemical weathering due to high CO2 concentration in the atmosphere and degradation of organic matter were the basic cause for the basinal chert in South China. 

常华进. 桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示[J]. 沉积学报, 2010, 28(6): 1098-1107.

引用本文:

常华进. 桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示[J]. 沉积学报, 2010, 28(6): 1098-1107.

CHANG Huajin. The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province[J]. Acta Sedimentologica Sinica, 2010, 28(6): 1098-1107.

Citation:

CHANG Huajin. The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province[J]. Acta Sedimentologica Sinica, 2010, 28(6): 1098-1107.

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桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

通讯作者:
常华进

计量

The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province

Corresponding author: CHANG Huajin

计量

目录

桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

青海师范大学生命与地理科学学院西宁810008

通讯作者: 常华进

English Abstract

The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province

School of Life and Geography Sciences, Qinghai Normal University, Xining 810008

Corresponding author: CHANG Huajin

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桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

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The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province

Corresponding author: CHANG Huajin

计量

出版历程

目录

桂北泗里口老堡组硅质岩的常量、稀土元素特征及成因指示

青海师范大学生命与地理科学学院 西宁810008

通讯作者: 常华进

English Abstract

The Major and REE Geochemistry of the Silikou Chert in Northern Guangxi Province

School of Life and Geography Sciences, Qinghai Normal University, Xining 810008

Corresponding author: CHANG Huajin

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期刊在线

联系我们

通讯作者:
常华进

青海师范大学生命与地理科学学院西宁810008