西沙石岛风成碳酸盐沉积的早期成岩作用

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西沙石岛风成碳酸盐沉积的早期成岩作用

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中图分类号: P588.2

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Early Diagenesis of Late Pleistocene Aeolian Carbonate Sediment on Shidao Island, Xisha Islands

摘要

摘要: 西沙石岛风成碳酸盐沉积形成于晚更新世，正处于早期成岩阶段。通过薄片、扫描电镜、稳定碳、氧同位素、常量元素和微量元素分析，对石岛风成碳酸盐岩的早期大气淡水成岩作用进行了研究。发现石岛风成碳酸盐沉积的早期成岩固结主要在大气淡水作用下完成，其中蒸发成岩作用在初始固结中可能起着主要作用；在大气淡水作用影响下，部分碎屑颗粒发生溶蚀和新生变形，新生的微亮晶低镁方解石（5~15 μm）镶边胶结在颗粒及孔隙周围，并成为主要的胶结物；而作为大气渗流带和潜流带典型产物的亮晶胶结物则很少占据主导地位。海水成岩作用主要表现为对早期成岩作用的改造，会造成锶、镁含量的增高，但影响范围仅止于浅表层，而且对δ13C和δ18O值的影响微弱。生物化学作用可能参与了古土壤中灰质壳与根管石的形成，但在风成碳酸盐沉积的整体成岩上不具意义。大气淡水成岩作用会造成石岛风成碳酸盐岩δ13C和δ18O值的降低，并使碎屑发生新生变形而导致锶、镁的淋溶。成壤风化作用会导致Al、Fe、Mn、Y、Cr元素在古土壤中明显富集，其中Al、Fe、Mn的富集与成壤风化作用有关，而Y、Cr元素则可能源于长期暴露引起的风尘或火山灰的相对富集。
- 石岛 /
- 风成碳酸盐沉积 /
- 早期成岩作用 /
- 大气淡水成岩作用
Abstract: The surface sediments on Shi Island of Xisha Islands are aeolian sediments, which have been formed during late Pleistocene, and they are undergoing early diagenesis. Through the detailed observation of outcrops, sections and SEM, combing with the analysis of stable isotope of carbon and oxygen, major elements and trace elements, we found the aeolian seddiments had been consolidated mainly in meteoric diagenetic environment, and the evaporation diagenesis might play an important role during the early consolidation of the aeolian sediments. Under the influence of meteoric diagenesis, part of clasts have been leached and experienced neomorphism. And the newly producted microspar low magnesium calcite (410 m) cements usually pectinally inlayed on the surface of grains or pores in form of graininess, and became main cements. However, the content of calcsparite cements, which usually taken as the marker products of vadose and phreatic diagenesis, were generally less than the microspar cements in the most of rocks. The sea water mainly influenced and altered the former meteoric diagenesis, could raise the content of Sr and Mg, while only the surface of aeolianite had been affected. And the sea water diagenesis had a little influence about the δ13C and δ18O of the aeolian carbonatite. However, the formation of calcrete and rhizoliths, which were mainly developed in the paleosols, might have been affected by biochemical process. But the biochemical process had little sense for the whole diagenesis of the aeolian sediments. The meteoric diagenesis could decline the δ13C and δ18O of the aeolian sediments, and leach the Sr2+ and Mg2+ by the neomorphism. For the pedogenesis, the palaeosols are relative abundant in Al (aluminium), Fe (ferrum), Mn (manganese), Y (yttrium) and Cr (chromium) than the aeolian calcarenite. Nevertheless, the concentration of Y (yttrium) and Cr (chromium) showed little relationship with pedogenesis, and we induced that they might come from travel fatigue or volcanic ash during the relatively long term exposure. 
- Shidao Island /
- aeolian carbonate sediment /
- early diagenesis /
- meteoric diagenesis

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[1]	董宏坤, 万世明, 刘喜停. 海洋沉积物早期成岩作用研究进展 . 沉积学报, 2022, 40(5): 1172-1187. doi: 10.14027/j.issn.1000-0550.2021.038
[2]	李泯星, 屈海洲, 程曦, 杨迅, 杨东凡, 张本健, 张云峰, 李晓. 火山作用对碳酸盐岩沉积及成岩的影响 . 沉积学报, 2020, 38(4): 810-825. doi: 10.14027/j.issn.1000-0550.2019.098
[3]	陈万利, 吴时国, 黄晓霞, 刘刚, 韩孝辉. 西沙群岛晚第四纪碳酸盐岩淡水成岩作用 . 沉积学报, 2020, 38(6): 1296-1312. doi: 10.14027/j.issn.1000-0550.2020.006
[4]	文华国, 罗连超, 罗晓彤, 游雅贤, 杜磊. 陆地热泉钙华研究进展与展望 . 沉积学报, 2019, 37(6): 1162-1180. doi: 10.14027/j.issn.1000-0550.2019.066
[5]	刘鹏. 渤南洼陷古近系早期成藏作用再认识及其地质意义 . 沉积学报, 2017, 35(1): 173-181. doi: 10.14027/j.cnki.cjxb.2017.01.017
[6]	强深涛, 沈平, 张健, 夏茂龙, 冯明友, 夏青松, 陶艳忠, 夏自强, 林怡. 四川盆地川中地区震旦系灯影组碳酸盐沉积物成岩作用与孔隙流体演化 . 沉积学报, 2017, 35(4): 797-811. doi: 10.14027/j.cnki.cjxb.2017.04.014
[7]	. 海拉尔盆地贝尔凹陷含片钠铝石沉凝灰岩的成岩作用 . 沉积学报, 2013, 31(3): 450-460.
[8]	李忠. 塔里木盆地塔河奥陶系碳酸盐岩储层埋藏成岩和构造—热流体作用及其有效性 . 沉积学报, 2010, 28(5): 969-979.
[9]	高磊, 李道季, 余立华, 王延明, 孔定江. 长江口崇明东滩沉积物间隙水中营养盐剖面及其数学模拟 . 沉积学报, 2006, (5): 722-732.
[10]	. 长江口崇明东滩沉积物间隙水中营养盐剖面及其数学模拟 . 沉积学报, 2006, 24(05): 722-732.
[11]	邓长瑜, 张秀莲, 陈建文, 王贤. 黔东南地区寒武系碳酸盐岩成岩作用分析 . 沉积学报, 2004, 22(4): 588-596.
[12]	姜月华, 岳文浙, 业治铮, 魏乃颐. 苏南下三叠统青龙组碳酸盐岩的成岩作用和孔隙演化 . 沉积学报, 1993, 11(1): 47-55.
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[15]	王益友, 张国栋, 朱静昌, 周福根. 长江口及其邻近陆架区沉积物的早期成岩作用 . 沉积学报, 1991, 9(1): 54-62.
[16]	李成生, 丁传谱, 杨楚雄, 易诗军. 湘中禾青地区中上泥盆统碳酸盐岩的成岩作用及其与成矿的关系 . 沉积学报, 1990, 8(3): 66-74.
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文章访问数: 1820
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西沙石岛风成碳酸盐沉积的早期成岩作用

刊出日期: 2013-04-10

中图分类号: P588.2

关键词:

石岛 /

风成碳酸盐沉积 /

早期成岩作用 /

大气淡水成岩作用

摘要: 西沙石岛风成碳酸盐沉积形成于晚更新世，正处于早期成岩阶段。通过薄片、扫描电镜、稳定碳、氧同位素、常量元素和微量元素分析，对石岛风成碳酸盐岩的早期大气淡水成岩作用进行了研究。发现石岛风成碳酸盐沉积的早期成岩固结主要在大气淡水作用下完成，其中蒸发成岩作用在初始固结中可能起着主要作用；在大气淡水作用影响下，部分碎屑颗粒发生溶蚀和新生变形，新生的微亮晶低镁方解石（5~15 μm）镶边胶结在颗粒及孔隙周围，并成为主要的胶结物；而作为大气渗流带和潜流带典型产物的亮晶胶结物则很少占据主导地位。海水成岩作用主要表现为对早期成岩作用的改造，会造成锶、镁含量的增高，但影响范围仅止于浅表层，而且对δ13C和δ18O值的影响微弱。生物化学作用可能参与了古土壤中灰质壳与根管石的形成，但在风成碳酸盐沉积的整体成岩上不具意义。大气淡水成岩作用会造成石岛风成碳酸盐岩δ13C和δ18O值的降低，并使碎屑发生新生变形而导致锶、镁的淋溶。成壤风化作用会导致Al、Fe、Mn、Y、Cr元素在古土壤中明显富集，其中Al、Fe、Mn的富集与成壤风化作用有关，而Y、Cr元素则可能源于长期暴露引起的风尘或火山灰的相对富集。

Early Diagenesis of Late Pleistocene Aeolian Carbonate Sediment on Shidao Island, Xisha Islands

Publish Date: 2013-04-10

Keywords:

Abstract: The surface sediments on Shi Island of Xisha Islands are aeolian sediments, which have been formed during late Pleistocene, and they are undergoing early diagenesis. Through the detailed observation of outcrops, sections and SEM, combing with the analysis of stable isotope of carbon and oxygen, major elements and trace elements, we found the aeolian seddiments had been consolidated mainly in meteoric diagenetic environment, and the evaporation diagenesis might play an important role during the early consolidation of the aeolian sediments. Under the influence of meteoric diagenesis, part of clasts have been leached and experienced neomorphism. And the newly producted microspar low magnesium calcite (410 m) cements usually pectinally inlayed on the surface of grains or pores in form of graininess, and became main cements. However, the content of calcsparite cements, which usually taken as the marker products of vadose and phreatic diagenesis, were generally less than the microspar cements in the most of rocks. The sea water mainly influenced and altered the former meteoric diagenesis, could raise the content of Sr and Mg, while only the surface of aeolianite had been affected. And the sea water diagenesis had a little influence about the δ13C and δ18O of the aeolian carbonatite. However, the formation of calcrete and rhizoliths, which were mainly developed in the paleosols, might have been affected by biochemical process. But the biochemical process had little sense for the whole diagenesis of the aeolian sediments. The meteoric diagenesis could decline the δ13C and δ18O of the aeolian sediments, and leach the Sr2+ and Mg2+ by the neomorphism. For the pedogenesis, the palaeosols are relative abundant in Al (aluminium), Fe (ferrum), Mn (manganese), Y (yttrium) and Cr (chromium) than the aeolian calcarenite. Nevertheless, the concentration of Y (yttrium) and Cr (chromium) showed little relationship with pedogenesis, and we induced that they might come from travel fatigue or volcanic ash during the relatively long term exposure. 

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西沙石岛风成碳酸盐沉积的早期成岩作用

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Early Diagenesis of Late Pleistocene Aeolian Carbonate Sediment on Shidao Island, Xisha Islands

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西沙石岛风成碳酸盐沉积的早期成岩作用

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Early Diagenesis of Late Pleistocene Aeolian Carbonate Sediment on Shidao Island, Xisha Islands

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西沙石岛风成碳酸盐沉积的早期成岩作用

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Early Diagenesis of Late Pleistocene Aeolian Carbonate Sediment on Shidao Island, Xisha Islands

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出版历程

目录

西沙石岛风成碳酸盐沉积的早期成岩作用

English Abstract

Early Diagenesis of Late Pleistocene Aeolian Carbonate Sediment on Shidao Island, Xisha Islands

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目录

友情链接

期刊在线

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