晚泥盆世大陆风化作用增强及其海洋环境效应：来自华南碳酸盐岩锶同位素的制约

邓发亮; 刘希军; 余红霞; 杨锋; 袁永海

doi:10.19509/j.cnki.dzkq.2021.0071

晚泥盆世大陆风化作用增强及其海洋环境效应：来自华南碳酸盐岩锶同位素的制约

doi: 10.19509/j.cnki.dzkq.2021.0071

邓发亮^{a, b,},
刘希军^{a, b},
余红霞^{a, b, ,},
杨锋^{a, b},
袁永海^{a, b}

a.
桂林理工大学地球科学学院, 广西桂林 541006
b.
桂林理工大学广西隐伏金属矿产勘查重点实验室, 广西桂林 541006

基金项目:

广西自然科学基金杰出青年科学基金项目 2018GXNSFFA281009

广西八桂学者项目 2018, 有色金属成矿理论与勘查技术

详细信息

作者简介:
邓发亮(1992—), 男, 现正攻读地球化学专业博士学位, 主要从事地球化学研究工作。E-mail: 943687331@qq.com

通讯作者:
余红霞(1986—), 女, 实验师，主要从事同位素地球化学研究工作。E-mail: 405244819@qq.com

中图分类号: P597;P534.44
计量
- 文章访问数: 458
- PDF下载量: 31
- 被引次数: 0
出版历程
- 收稿日期: 2021-04-29
- 网络出版日期: 2022-09-07

Enhanced continental weathering and its marine environmental effects in the late Devonian: Constraints from strontium isotopes of carbonate rocks in South China

Deng Faliang^{a, b
,},
Liu Xijun^{a, b},
Yu Hongxia^{a, b
, ,},
Yang Feng^{a, b},
Yuan Yonghai^{a, b}

a.
School of Earth Sciences, Guilin University of Technology, Guilin Guangxi 541006, China
b.
Guangxi Key Laboratory of Exploration for Hidden Metallic Ore Deposits, Guilin University of Technology, Guilin Guangxi 541006, China

摘要

摘要:
上泥盆统弗拉斯阶和法门阶界线附近发生了大规模的生物灭绝, 其起因被认为是植物登陆导致的陆地化学风化作用加强及其引起的海洋水体缺氧所致, 但其直接证据还比较缺乏。运用广西地区广泛发育的浅海碳酸盐岩中锶元素(Sr)和同位素(⁸⁷Sr/⁸⁶Sr)、铀钍比值(U/Th)记录, 探究了从中泥盆统到下石炭统的陆地化学风化速率及海水氧化还原条件的变化。研究结果表明, 在晚泥盆世(法门阶早期)陆地化学风化作用加强, 导致海水中Sr浓度升高, 及更富集重的Sr同位素组分; 低的U/Th比值也显示该时期水体缺氧严重, 海水中U元素被还原到沉积物中, 导致海水中的U浓度降低。陆地表面化学风化的加强对晚泥盆世海洋水体氧化还原条件的波动以及海洋生物的灭绝有重要影响。
- 风化速率 /
- 水体缺氧 /
- 植物登陆 /
- 生物大灭绝 /
- 碳酸盐岩 /
- 锶同位素
Abstract:
The Frasnian-Famennian extinction in the late Devonian was one of the largest mass extinction during Earth's history, which was believed to be caused by the plant landing-indued intensification of terrestrial chemical weathering and the consequent hypoxia of marine water. However, direct evidence remains limited. Here, we apply strontium (Sr) concentrations and isotopes (⁸⁷Sr/⁸⁶Sr) as well as uranium-thorium ratios (U/Th) of shallow marine carbonate rocks that are widely developed in the Guangxi area to explore the rate of continental chemical weathering and the redox condition of seawater from the middle devonian to lower Carboniferous. The results show that, the intensification of terrestrial chemical weathering in the late Devonian (early Famennian) caused the increase of Sr concentration and the enrichment of heavy Sr isotopes in seawater. The low U/Th ratio in carbonate also suggests that the water was highly hypoxia during this period. Uranium in seawater was reduced and deposited in sediments, resulting in the decrease of U concentration in seawater. The intensification of chemical weathering on land surface has a significant influence on the fluctuation of redox conditions and the extinction of marine organisms in the late Devonian.
- weathering rate /
- hypoxia of water /
- plant landing /
- mass extinction /
- carbonate rock /
- strontium isotope

HTML全文

图 1 研究区域地质图和采样点位置

Figure 1. A simplified geological map of the study area and sample locations

下载: 全尺寸图片幻灯片

图 2 研究剖面的采样位置和样品岩性描述

Figure 2. Sample location and lithological descriptions

下载: 全尺寸图片幻灯片

图 3 镜下矿物组成(a.正交镜下)和化石(b.偏光镜下)

Figure 3. Micrographs of mineral assemblage (a) and fossils (b)

下载: 全尺寸图片幻灯片

图 4 研究剖面的地球化学曲线

a.w(Sr)变化曲线；b.锶同位素(⁸⁷Sr/⁸⁶Sr)变化曲线，Sr同位素高值表示陆源输入量大；c.U/Th值变化曲线，碳酸盐岩U/Th值越高表明水体越氧化

Figure 4. Geochemical variation curves of the studied lithological section

下载: 全尺寸图片幻灯片

图 5 U/Th和Sr同位素的散点图

红色的点表示五指山组下部的样品，黑色的点表示东岗岭组、五指山顶部和岩关组的样品

Figure 5. Scatter plots of U/Th and Sr isotopes

下载: 全尺寸图片幻灯片

表 1 Sr同位素、Sr、Th、U质量分数和U/Th比值

Table 1. Sr isotope, Sr, Th and U concentrations, and U/Th ratios

样品编号	⁸⁷Sr/⁸⁶Sr	RSD/ 10^-6	Sr	Th	U	U/Th
样品编号	⁸⁷Sr/⁸⁶Sr	RSD/ 10^-6	w_B/10^-6			U/Th
2016YD-001	0.709 713	6.614 6	102	0.31	0.59	1.93
2016YD-002	0.709 084	11.076 6	33	0.06	0.28	5.07
2016YD-003	0.710 457	16.466 3	40.7	0.15	0.58	3.96
2016YD-004	0.708 131	14.563 1	167	0.11	1.04	9.68
2016YD-005	0.708 145	16.646 6	108	0.13	1.64	12.90
2016YD-006	0.708 048	11.708 1	295	0.24	1.86	7.72
2016YD-007	0.708 704	12.870 3	47.7	0.15	0.59	3.91
2016YD-008	0.708 414	18.139 7	2 037	0.24	1.88	7.91
2016YD-009	0.708 114	11.554 8	263	0.09	0.52	5.80
2016YD-010	0.711 489	17.995 7	265	3.48	0.83	0.24
2016YD-011	0.710 455	16.073 6	614	4.01	0.84	0.21
2016YD-012	0.710 131	16.522 1	154	1.05	0.70	0.67
2016YD-013	0.708 340	17.426 4	723	0.07	0.27	3.86
2016YD-014	0.707 987	16.349 6	341	0.06	0.35	6.12

下载: 导出CSV

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