华南中三叠世关岭地层的古气候演化及其对罗平生物群保存的意义

IF 4 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Global and Planetary Change Pub Date : 2024-09-16 DOI:10.1016/j.gloplacha.2024.104588

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引用次数: 0

摘要

中三叠世被认为是二叠纪末生物大灭绝后生物恢复的重要时期，其中中三叠世罗平生物群代表了海洋生态系统的全面恢复。然而，人们对中三叠世生物恢复与环境演化之间关系的研究仍然知之甚少。为了研究这个问题，我们对产生罗平生物群的安息期（中三叠世）演替（华南连泥段关岭地层第二系）进行了微地层分析和多种地球化学代用指标（Al、Ti、Th、Sc和∑REY）的研究。通过野外调查和微地层分析，确定了五个沉积面：开放平台、限制平台、滩涂、浅滩和平台内凹陷。根据多种地球化学代用指标的变化，可将该区段划分为五个阶段。第四阶段由开阔平台向平台内凹陷突然转变，Al、Ti、Sc、Th 和 ∑REY 含量较高，表明海平面迅速上升，碎屑输入增加，与罗平生物群的保存相吻合。这些证据表明，全球变暖、全球海平面上升和频繁的区域火山活动导致大陆风化加剧，促进了罗平生物群的死亡和保存。

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Paleoclimate evolution of the Middle Triassic Guanling Formation from South China and its significance for the preservation of the Luoping biota

The Middle Triassic is regarded as an important period of biotic recovery after the end-Permian mass extinction, of which the Middle Triassic Luoping biota represents a full recovery of marine ecosystem. However, the research on the relationship between biotic recovery and environmental evolution in the Middle Triassic remains poorly understood. To investigate this issue, microfacies analysis and multiple geochemical proxies (Al, Ti, Th, Sc, and ∑REY) of an Anisian (Middle Triassic) succession (the Member II of the Guanling Formation, Leniduo section, South China) yielding the Luoping biota are carried out. Five sedimentary facies are identified through field investigation and microfacies analysis: open platform, restricted platform, tidal flat, shoal and intra-platform depression. According to the changes of multiple geochemical proxies, this section can be divided into five stages. A sudden facies transition from open platform to intra-platform depression, and high contents of Al, Ti, Sc, Th, and ∑REY in stage IV indicate a rapid sea-level rise and detrital input increase, coinciding with the preservation of the Luoping biota. This evidence suggest that enhanced continental weathering caused by global warming, global sea level rise, and frequent regional volcanic activities promoted the death and preservation of the Luoping biota.

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来源期刊

Global and Planetary Change 地学天文-地球科学综合

CiteScore

7.40

自引率

10.30%

发文量

226

审稿时长

63 days

期刊介绍： The objective of the journal Global and Planetary Change is to provide a multi-disciplinary overview of the processes taking place in the Earth System and involved in planetary change over time. The journal focuses on records of the past and current state of the earth system, and future scenarios , and their link to global environmental change. Regional or process-oriented studies are welcome if they discuss global implications. Topics include, but are not limited to, changes in the dynamics and composition of the atmosphere, oceans and cryosphere, as well as climate change, sea level variation, observations/modelling of Earth processes from deep to (near-)surface and their coupling, global ecology, biogeography and the resilience/thresholds in ecosystems. Key criteria for the consideration of manuscripts are (a) the relevance for the global scientific community and/or (b) the wider implications for global scale problems, preferably combined with (c) having a significance beyond a single discipline. A clear focus on key processes associated with planetary scale change is strongly encouraged. Manuscripts can be submitted as either research contributions or as a review article. Every effort should be made towards the presentation of research outcomes in an understandable way for a broad readership.