下侏罗统辛涅缪尔阶—普林斯巴阶界线地质事件研究进展

葛禹; 时志强

doi:10.19509/j.cnki.dzkq.2022.0071

下侏罗统辛涅缪尔阶—普林斯巴阶界线地质事件研究进展

doi: 10.19509/j.cnki.dzkq.2022.0071

葛禹^{a, b,},
时志强^{a, b, ,}

a.
成都理工大学沉积地质研究院, 成都 610059
b.
成都理工大学油气藏地质及开发工程国家重点实验室, 成都 610059

基金项目:

国家自然科学基金面上项目 41572085

详细信息

作者简介:
葛禹(1995—), 男, 现正攻读沉积学专业硕士学位, 主要从事沉积地质研究工作。E-mail: geyuy@qq.com

通讯作者:
时志强(1972—), 男, 教授, 主要从事沉积地质研究工作。E-mail: szqcdut@163.com

中图分类号: P534.52
计量
- 文章访问数: 346
- PDF下载量: 46
- 被引次数: 0
出版历程
- 收稿日期: 2021-07-16

Sinemurian-Pliensbachian boundary event (Early Jurassic): Current status and future challenges

Ge Yu^{a, b
,},
Shi Zhiqiang^{a, b
, ,}

a.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
b.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要:
早侏罗世经历了赫塘期、辛涅缪尔期、普林斯巴期和土阿辛期, 其中土阿辛期大洋缺氧事件(T-OAE)被广泛研究。但在辛涅缪尔阶-普林斯巴阶界线处, δ¹³C_org及δ¹³C_carb曲线均发生负偏, 局部伴随黑色页岩沉积。其在英国、法国、意大利、葡萄牙以及中国等地区都有记录, 碳同位素的变化伴随着环境、气候的变化, 研究显示该事件可能是全球性的, 被称为“S-P界线事件”(SPBE)。此次地质事件与T-OAE事件类似, 也显示了一次大洋缺氧事件, 其发生时有轻碳同位素被排入了大气系统中, 但是轻碳同位素的来源尚不明确, 部分学者认为是大火成岩省喷发时排放的轻碳物质注入了海洋-大气系统所致。目前对该事件的研究主要集中于欧洲海相地层, 其对陆地生态系统的影响还知之甚少。我国四川盆地下侏罗统湖相沉积发育良好, 下侏罗统自流井组东岳庙段沉积有与大安寨段(T-OAE发生层段)类似的黑色页岩及介壳灰岩, 其有机碳同位素负偏, 显示了S-P界线事件的影响, 其与T-OAE类似也对四川盆地早侏罗世古湖泊产生了影响。
- 早侏罗世 /
- S-P界线事件 /
- 大洋缺氧事件 /
- 碳同位素偏移
Abstract:
The Lower Jurassic is composed of the Hettangian, Sinemurian, Pliensbachian and Toarcian, among which the Toarcian oceanic anoxic events (T-OAE) have been widely studied. Depositions of black shales and negative excursions of both δ¹³C_org and δ¹³C_carb at the Sinemuiran-Primbalian boundary, which has been recorded in the United Kingdom, France, Italy, Portugal and China.This event, known as the "S-P boundary event" (SPBE), characterized by significant carbon isotope, environmental and climatic perturbations in global scale. It is considered to be similar to the T-OAE, a well-known oceanic anoxic event, during which light carbon was released into the atmospheric system, although it is still unknown the sources of the carbon inputs. Research has so far dominantly focused on the marine strata in Europe, while few studies have evaluated the Lower Jurassic terrestrial strata. The Lower Jurassic lacustrine deposits are well developed in the Sichuan Basin, China. Similar to the T-OAE in the Daanzhai Member of Ziliujing Formation, the negative excursion of δ¹³C_org was recorded in the blackshales and shelly limestones of the Dongyuemiao Member, Ziliujing Formation, indicating that the SPBE likewise has an impact on the Early Jurassic ancient lake in the Sichuan Basin.
- Early Jurassic /
- Sinemurian-Pliensbachian boundary event /
- ocean anoxic event /
- carbon isotope excursion

HTML全文

图 1 S-P界线事件主要研究区域古地理分布图(底图改自文献[11])

1.英国，Cardigan Bay盆地Mochras剖面、Cleveland盆地Robin Hood海湾剖面; 2.法国, 巴黎盆地Sancerre-Couy岩心; 3.葡萄牙, Lusitanian盆地S. Pedro de Moel剖面；4.意大利, Trento台地Viote剖面、Lormbardian盆地Tofino剖面；5.中国，四川盆地大槽剖面

Figure 1. Palaeogeographical distribution of the studied regions of S-P boundary event

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图 2 英国Cardigan Bay盆地Mochras农场HI值和有机碳同位素曲线图(据文献[22]修改)

Figure 2. HI, TOC and δ¹³C_TOC curves at Mochras, Cardigan Bay Basin, United Kingdom

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图 3 欧洲早侏罗世海相地层对比图

Figure 3. Stratigraphic correlation of Early Jurassic marine sequences in the Europe

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图 4 早侏罗世的碳同位素地层划分与对比

Figure 4. Division and correlation of carbon isotopic strata in the Early Jurassic

下载: 全尺寸图片幻灯片

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