三塘湖盆地二叠系陆相热水沉积方沸石岩特征及成因分析

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三塘湖盆地二叠系陆相热水沉积方沸石岩特征及成因分析

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中图分类号: P578.974

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Lithology and Origin Analysis of Sublacustrine Hydrothermal Deposits Characterized by Analcime, Sanidine, Dolomite, Quartz, etc. in Lucaogou Formation, Middle Permian, Santanghu Basin, Northeast Xinjiang, China

摘要

摘要: 在新疆三塘湖盆地野外露头及钻井中二叠统芦草沟组(P2l)厚层黑色泥岩中发现多层白色纹层状方沸石岩。根据主要造岩矿物特征，将其大致分为两类，第一类为方沸钾长白云岩，主要造岩矿物包括细粒方沸石、泥晶钾长石（透长石、正长石）、泥晶白云石、泥晶铁白云石等，碳酸盐矿物以高的Fe、Mn含量为特征；第二类为方沸硅质岩与硅质方沸石岩，以细粒方沸石及泥晶石英为主，含少量碳酸盐。扫描电镜观察方沸石以自形的四角三八面体少见，多为它形块状或无定形胶体状。样品主量元素以富SiO2、Al2O3、Na2O、贫TiO2为特征，微量元素Th、Nb、Ti强烈亏损，Sr/Nd比值为44.73~831.78，Nb*介于0.02~0.17之间。∑REE总量偏低7.33~20.619 μg/g，LREE/HREE为4.77~11.20，δEu 0.60~0.99略具负异常，δCe 0.96~1.04，基本无亏损，稀土配分曲线为较平缓的右倾。方沸石岩微量元素、稀土元素配分曲线与研究区早、中二叠世玄武岩、粗面岩及上地壳有较大差异。87Sr/86Sr介于0.705 118~0.706 438之间，低于同时期全球海水及中上二叠统海相碳酸盐的87Sr/86Sr比值，143PNd/144Nd介于0.512 454~0.512 713之间，εNd介于-0.81~3.84之间，表明造岩热液可能含有幔源组分。通过详细的岩石学、地球化学及Sr、Nd同位素研究，认为这是一类与陆相裂谷盆地湖底热泉喷流作用有关的热水沉积岩组合，热液组分除了有壳源物质及大气水等的混入外，可能还有深部物质的参与。
- 三塘湖盆地 /
- 中二叠统 /
- 陆内裂谷 /
- 方沸石 /
- 地球化学 /
- 湖底热液 /
- 热水沉积岩
Abstract: Santanhu Basin, located in northeast of Xinjiang, China, was developed a contenental rift basin from Late Carboniferous to Middle Permian. On the outcrop and the drilling cores of the basin, layers of sublacustrine hydrothermal deposits from which six of them were sampled, were found in the thick mudstones in Lucaogou Formation(P2l), Middle Permian. The hydrothermal samples can be divided into two types: the first type is formed of analcime, sanidine, orthoclase, dolomite and ankerite.The carbonates were detected of concentrating iron and manganese. The second type is formed of analcime, quartz, and carbonates. Most analcime was observed to be xenomorphic block or amorphous gelatinoid otherwise from automorphic tetragonaltrisoctahedron under the SEM. Major elements of all samples were characterized as being rich in SiO2, Al2O3，Na2O，and poor in TiO2. Trace element of the samples show enrichemnt of highly incompatibility elements, such as Ba, Rb, K, Ta, Sr, Zr and Hf, and are lack of Th, Nb, and Ti relatively. The ratios of Sr/Nd = 44.73~831.78, Nb*=0.02~0.17. ΣREE= 7.33 ~20.619 μg/g, LaN/YbN=2.50 ~16.00, LREE/HREE=4.77～11.20. δEu varies from0.6 to 0.99 which shows negative anomalism to primitive mantle , however, δCe value which varies from 0.96 to 1.04 shows the similarity to primitive mantle. The major and trace elements (includes REE) reveal the distinct differences with the basalts and trachytoids of Permian in the same basin, and also disagree with the average value of Upper Crust. 87Sr/86Sr = 0.705 118~0.706 438, 143Nd/144Nd =0.512454~0.512713，εNd=0.81～3.84. Isotope composition indicates that mantle materials may participate in the hydrothermal fluid with which the hydrothermal minerals were deposited. By the analysis of the lithology, geochemistry, and Sr, Nd isotope, the characteristics of the samples suggest that they are an assemblage of hydrothermal rocks which are related to the hot springs exhalation at the lake bottom in Santanghu continental rift basin. Besides the Crust and meteoric components, the hydrothermal fluid of the rocks was probabely composed of the substance sourced from deep earth. 
- Santanghu Basin /
- Middle Permian /
- continental rift basin /
- analcime, geochemistry /
- sublacustrine hydrothermal fluid /
- hydrothermal sedimentary rocks /

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[1]	杨朝屹, 夏青松, 杨鹏, 何成其, 刘芳兰, 卿山. 川西—川北地区中二叠统白云岩成岩流体特征分析及复合成岩环境重建 . 沉积学报, 2024, (): -. doi: 10.14027/j.issn.1000-0550.2024.021
[2]	张景琦, 金振奎, 王金艺, 李阳, 袁坤. 滇东—黔西中二叠统白云岩特征、成因及其主控因素 . 沉积学报, 2024, 42(1): 95-112. doi: 10.14027/j.issn.1000-0550.2022.009
[3]	彭旸, 王波, 于海跃, 董雨洋, 盛莉娜, 杨琳娜, 刘少治, 王少依, 朱晨. 新疆三塘湖盆地条湖-马朗凹陷中下侏罗纪沉积体系演化及物源分析 . 沉积学报, 2024, (): -. doi: 10.14027/j.issn.1000-0550.2023.125
[4]	张云望, 金鑫, 乔培军, 李滨兵, 洪彦哲, 陈俞超, 芦刚, 杜怡星, 时志强. 鄂尔多斯盆地东北部下侏罗统富县组沉积物源分析 . 沉积学报, 2023, 41(5): 1414-1429. doi: 10.14027/j.issn.1000-0550.2022.154
[5]	侯阳红, 康志宏, 赵晨君, 余旭东, 王恩博. 下扬子地区下寒武统幕府山组黑色岩系地球化学特征及其地质意义 . 沉积学报, 2020, 38(4): 886-897. doi: 10.14027/j.issn.1000-0550.2019.076
[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]	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
[8]	李哲萱, 柳益群, 周鼎武, 焦鑫, 南云. 三塘湖盆地二叠系芦草沟组喷爆岩岩石学、矿物学特征及相关问题探讨 . 沉积学报, 2019, 37(3): 455-465. doi: 10.14027/j.issn.1000-0550.2018.145
[9]	王越. 新疆塔尔朗沟剖面中二叠统扇三角洲混合沉积特征及模式 . 沉积学报, 2019, 37(5): 922-933. doi: 10.14027/j.issn.1000-0550.2018.190
[10]	焦鑫, 柳益群, 靳梦琪, 周鼎武. 新疆三塘湖薄层状岩浆-热液白云质喷流沉积岩 . 沉积学报, 2017, 35(6): 1087-1096. doi: 10.14027/j.cnki.cjxb.2017.06.001
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三塘湖盆地二叠系陆相热水沉积方沸石岩特征及成因分析

刊出日期: 2012-04-10

中图分类号: P578.974

关键词:

方沸石 /

摘要: 在新疆三塘湖盆地野外露头及钻井中二叠统芦草沟组(P2l)厚层黑色泥岩中发现多层白色纹层状方沸石岩。根据主要造岩矿物特征，将其大致分为两类，第一类为方沸钾长白云岩，主要造岩矿物包括细粒方沸石、泥晶钾长石（透长石、正长石）、泥晶白云石、泥晶铁白云石等，碳酸盐矿物以高的Fe、Mn含量为特征；第二类为方沸硅质岩与硅质方沸石岩，以细粒方沸石及泥晶石英为主，含少量碳酸盐。扫描电镜观察方沸石以自形的四角三八面体少见，多为它形块状或无定形胶体状。样品主量元素以富SiO2、Al2O3、Na2O、贫TiO2为特征，微量元素Th、Nb、Ti强烈亏损，Sr/Nd比值为44.73~831.78，Nb*介于0.02~0.17之间。∑REE总量偏低7.33~20.619 μg/g，LREE/HREE为4.77~11.20，δEu 0.60~0.99略具负异常，δCe 0.96~1.04，基本无亏损，稀土配分曲线为较平缓的右倾。方沸石岩微量元素、稀土元素配分曲线与研究区早、中二叠世玄武岩、粗面岩及上地壳有较大差异。87Sr/86Sr介于0.705 118~0.706 438之间，低于同时期全球海水及中上二叠统海相碳酸盐的87Sr/86Sr比值，143PNd/144Nd介于0.512 454~0.512 713之间，εNd介于-0.81~3.84之间，表明造岩热液可能含有幔源组分。通过详细的岩石学、地球化学及Sr、Nd同位素研究，认为这是一类与陆相裂谷盆地湖底热泉喷流作用有关的热水沉积岩组合，热液组分除了有壳源物质及大气水等的混入外，可能还有深部物质的参与。

Lithology and Origin Analysis of Sublacustrine Hydrothermal Deposits Characterized by Analcime, Sanidine, Dolomite, Quartz, etc. in Lucaogou Formation, Middle Permian, Santanghu Basin, Northeast Xinjiang, China

Publish Date: 2012-04-10

Keywords:

Abstract: Santanhu Basin, located in northeast of Xinjiang, China, was developed a contenental rift basin from Late Carboniferous to Middle Permian. On the outcrop and the drilling cores of the basin, layers of sublacustrine hydrothermal deposits from which six of them were sampled, were found in the thick mudstones in Lucaogou Formation(P2l), Middle Permian. The hydrothermal samples can be divided into two types: the first type is formed of analcime, sanidine, orthoclase, dolomite and ankerite.The carbonates were detected of concentrating iron and manganese. The second type is formed of analcime, quartz, and carbonates. Most analcime was observed to be xenomorphic block or amorphous gelatinoid otherwise from automorphic tetragonaltrisoctahedron under the SEM. Major elements of all samples were characterized as being rich in SiO2, Al2O3，Na2O，and poor in TiO2. Trace element of the samples show enrichemnt of highly incompatibility elements, such as Ba, Rb, K, Ta, Sr, Zr and Hf, and are lack of Th, Nb, and Ti relatively. The ratios of Sr/Nd = 44.73~831.78, Nb*=0.02~0.17. ΣREE= 7.33 ~20.619 μg/g, LaN/YbN=2.50 ~16.00, LREE/HREE=4.77～11.20. δEu varies from0.6 to 0.99 which shows negative anomalism to primitive mantle , however, δCe value which varies from 0.96 to 1.04 shows the similarity to primitive mantle. The major and trace elements (includes REE) reveal the distinct differences with the basalts and trachytoids of Permian in the same basin, and also disagree with the average value of Upper Crust. 87Sr/86Sr = 0.705 118~0.706 438, 143Nd/144Nd =0.512454~0.512713，εNd=0.81～3.84. Isotope composition indicates that mantle materials may participate in the hydrothermal fluid with which the hydrothermal minerals were deposited. By the analysis of the lithology, geochemistry, and Sr, Nd isotope, the characteristics of the samples suggest that they are an assemblage of hydrothermal rocks which are related to the hot springs exhalation at the lake bottom in Santanghu continental rift basin. Besides the Crust and meteoric components, the hydrothermal fluid of the rocks was probabely composed of the substance sourced from deep earth. 

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三塘湖盆地二叠系陆相热水沉积方沸石岩特征及成因分析

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Lithology and Origin Analysis of Sublacustrine Hydrothermal Deposits Characterized by Analcime, Sanidine, Dolomite, Quartz, etc. in Lucaogou Formation, Middle Permian, Santanghu Basin, Northeast Xinjiang, China

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三塘湖盆地二叠系陆相热水沉积方沸石岩特征及成因分析

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Lithology and Origin Analysis of Sublacustrine Hydrothermal Deposits Characterized by Analcime, Sanidine, Dolomite, Quartz, etc. in Lucaogou Formation, Middle Permian, Santanghu Basin, Northeast Xinjiang, China

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三塘湖盆地二叠系陆相热水沉积方沸石岩特征及成因分析

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Lithology and Origin Analysis of Sublacustrine Hydrothermal Deposits Characterized by Analcime, Sanidine, Dolomite, Quartz, etc. in Lucaogou Formation, Middle Permian, Santanghu Basin, Northeast Xinjiang, China

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三塘湖盆地二叠系陆相热水沉积方沸石岩特征及成因分析

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Lithology and Origin Analysis of Sublacustrine Hydrothermal Deposits Characterized by Analcime, Sanidine, Dolomite, Quartz, etc. in Lucaogou Formation, Middle Permian, Santanghu Basin, Northeast Xinjiang, China

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