非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

卿海若

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非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

卿海若

文章导航 > 沉积学报 > 2010 > 28(5): 980-986

卿海若. 非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据[J]. 沉积学报, 2010, 28(5): 980-986.

引用本文:

卿海若. 非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据[J]. 沉积学报, 2010, 28(5): 980-986.

QING Hairuo. Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada[J]. Acta Sedimentologica Sinica, 2010, 28(5): 980-986.

Citation:

QING Hairuo. Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada[J]. Acta Sedimentologica Sinica, 2010, 28(5): 980-986.

卿海若. 非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据[J]. 沉积学报, 2010, 28(5): 980-986.

引用本文:

卿海若. 非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据[J]. 沉积学报, 2010, 28(5): 980-986.

Citation:

非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

卿海若

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

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卿海若

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Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada

QING Hairuo

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

More Information

Corresponding author: QING Hairuo

摘要

摘要: 加拿大萨斯喀彻温省东南部上奥陶统Yeoman组碳酸盐岩中发育有少量的鞍形白云石胶结物。这些鞍形白云石仅局限于Yeoman组上部厚约20~30 m的白云岩带中，上覆及下伏碳酸盐岩地层中均明显缺失这类鞍形白云石，表明其形成于一个相对封闭的体系中。此类奥陶系鞍形白云石胶结物以具有与宿主交代白云岩相似的碳同位素δ13C值（-0.2‰~0.9‰PDB）及锶同位素比值（0.708 2~0.709 0）为特征，表明前期的白云石围岩通过压溶作用形成的碳和锶是鞍形白云石胶结物的主要来源。另外，测得的鞍形白云石胶结物均一温度范围为99~105℃，可以由该区域的正常埋藏温度解释。基于上述资料和观察，我们认为萨斯喀彻温省东南部上奥陶统Yeoman组鞍形白云石胶结物与早期交代白云石的自调节白云石化作用（埋藏过程中相对封闭的体系中通过化学压实作用形成）有关，而与加西盆地其它地方已经证实的热液活动无关。因此，鞍形白云石的分布未必指示热液活动或热流体，也并不是所有的鞍形白云石都与热流体有关。
- 鞍形白云石非热液成因压溶作用奥陶系Yeoman组威利斯顿盆
Abstract: Minor saddle dolomite cements are identified in the Upper Ordovician Yeoman carbonate rocks in southeastern Saskatchewan, Canada. These saddle dolomite cements are restricted to upper part of the Yeoman Formation, in a 20~30 m zone of dolomite rocks, and they are conspicuously absent both in the overlying and underlain carbonate strata, suggesting their precipitation in a relatively closed system. These Ordovician saddle dolomite cements are characterized by δ13C values (0.2‰ to 0.9 ‰ PDB) and Sr isotopic ratios (0.7082 to 0.7090) similar to those of their host replacement dolomites, indicating the sources of carbon and strontium for the saddle dolomite cements were mostly from precursor host dolomite rocks via pressure dissolution. In addition, the measured homogenization temperatures from the saddle dolomite cements vary from 99 to 105℃, which could be accounted for by the normal burial temperatures in the region. Based on these data and observations, the saddle dolomite cements in the Upper Ordovician Yeoman Formation in southeastern Saskatchewan are interpreted to be related to cannibalization of earlier replacement dolomite through chemical compaction in a relatively closed system during burial, rather than related to hydrothermal activities documented elsewhere in the Western Canada Sedimentary Basin. The occurrences of saddle dolomite, therefore, are not necessarily indicative of hydrothermal activity or fluids; nor are all saddle dolomites definitely related to hydrothermal fluids.
- saddle dolomite

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[1]	戴逸晨, 高达, 黄理力, 王斌, 周慧, 孙春燕, 张天付, 朱传勇, 赵玉茹. 麦盖提斜坡中—下奥陶统碳酸盐岩多期白云石化作用 . 沉积学报, 2025, 43(1): 169-181. doi: 10.14027/j.issn.1000-0550.2023.006
[2]	王丹. 塔北、塔中地区寒武系—奥陶系白云岩多成因模式 . 沉积学报, 2024, 42(3): 857-876. doi: 10.14027/j.issn.1000-0550.2023.128
[3]	王剑, 周路, 刘金, 马聪, 卞保力, 李啸, 张宝真. 湖相热液白云岩成因机理 . 沉积学报, 2024, 42(1): 130-141. doi: 10.14027/j.issn.1000-0550.2022.037
[4]	梁子珩, 甯濛, 文华国, 沈冰. 白云石成因中的“硫酸根之谜”：回顾与展望 . 沉积学报, 2024, (): -. doi: 10.14027/j.issn.1000-0550.2024.122
[5]	赵东方, 谭秀成, 罗冰, 王小芳, 乔占峰, 罗思聪. 微生物诱导白云石沉淀研究进展及面临的挑战 . 沉积学报, 2022, 40(2): 335-349. doi: 10.14027/j.issn.1000-0550.2020.119
[6]	郑浩夫, 袁璐璐, 刘波, 张学丰, 沈瑛楚, 王远翀. 川西南中二叠统中粗晶白云石流体来源分析 . 沉积学报, 2020, 38(3): 589-597. doi: 10.14027/j.issn.1000-0550.2019.046
[7]	王珏博, 谷一凡, 陶艳忠, 强子同, 强深涛, 蒋婵. 川中地区茅口组两期流体叠合控制下的白云石化模式 . 沉积学报, 2016, 34(2): 236-249. doi: 10.14027/j.cnki.cjxb.2016.02.003
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非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

卿海若

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

通讯作者: 卿海若

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

关键词:

鞍形白云石非热液成因压溶作用奥陶系Yeoman组威利斯顿盆

摘要: 加拿大萨斯喀彻温省东南部上奥陶统Yeoman组碳酸盐岩中发育有少量的鞍形白云石胶结物。这些鞍形白云石仅局限于Yeoman组上部厚约20~30 m的白云岩带中，上覆及下伏碳酸盐岩地层中均明显缺失这类鞍形白云石，表明其形成于一个相对封闭的体系中。此类奥陶系鞍形白云石胶结物以具有与宿主交代白云岩相似的碳同位素δ13C值（-0.2‰~0.9‰PDB）及锶同位素比值（0.708 2~0.709 0）为特征，表明前期的白云石围岩通过压溶作用形成的碳和锶是鞍形白云石胶结物的主要来源。另外，测得的鞍形白云石胶结物均一温度范围为99~105℃，可以由该区域的正常埋藏温度解释。基于上述资料和观察，我们认为萨斯喀彻温省东南部上奥陶统Yeoman组鞍形白云石胶结物与早期交代白云石的自调节白云石化作用（埋藏过程中相对封闭的体系中通过化学压实作用形成）有关，而与加西盆地其它地方已经证实的热液活动无关。因此，鞍形白云石的分布未必指示热液活动或热流体，也并不是所有的鞍形白云石都与热流体有关。

English Abstract

Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada

QING Hairuo

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

Corresponding author: QING Hairuo

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

Keywords:

saddle dolomite

Abstract: Minor saddle dolomite cements are identified in the Upper Ordovician Yeoman carbonate rocks in southeastern Saskatchewan, Canada. These saddle dolomite cements are restricted to upper part of the Yeoman Formation, in a 20~30 m zone of dolomite rocks, and they are conspicuously absent both in the overlying and underlain carbonate strata, suggesting their precipitation in a relatively closed system. These Ordovician saddle dolomite cements are characterized by δ13C values (0.2‰ to 0.9 ‰ PDB) and Sr isotopic ratios (0.7082 to 0.7090) similar to those of their host replacement dolomites, indicating the sources of carbon and strontium for the saddle dolomite cements were mostly from precursor host dolomite rocks via pressure dissolution. In addition, the measured homogenization temperatures from the saddle dolomite cements vary from 99 to 105℃, which could be accounted for by the normal burial temperatures in the region. Based on these data and observations, the saddle dolomite cements in the Upper Ordovician Yeoman Formation in southeastern Saskatchewan are interpreted to be related to cannibalization of earlier replacement dolomite through chemical compaction in a relatively closed system during burial, rather than related to hydrothermal activities documented elsewhere in the Western Canada Sedimentary Basin. The occurrences of saddle dolomite, therefore, are not necessarily indicative of hydrothermal activity or fluids; nor are all saddle dolomites definitely related to hydrothermal fluids.

卿海若. 非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据[J]. 沉积学报, 2010, 28(5): 980-986.

引用本文:

卿海若. 非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据[J]. 沉积学报, 2010, 28(5): 980-986.

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非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

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卿海若

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Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada

Corresponding author: QING Hairuo

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非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

通讯作者: 卿海若

English Abstract

Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

Corresponding author: QING Hairuo

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非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

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Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada

Corresponding author: QING Hairuo

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非热液成因的鞍形白云石：来自加拿大萨斯喀彻温省东南部奥陶系Yeoman组的岩石学和地球化学证据

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

通讯作者: 卿海若

English Abstract

Nonhydrothermal Saddle Dolomite: Petrological and Geochemical Evidence from the Ordovician Yeoman Formation, Southeastern Saskatchewan, Canada

Department of Geology, University of Regina, Regina, SK, S4S 0A2, Canada

Corresponding author: QING Hairuo

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