Developments in the stratigraphy of the Deccan Volcanic Province, peninsular India

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Omkar Verma , Ashu Khosla
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引用次数: 25

Abstract

The Deccan Volcanic Province has been considered as one of the largest magmatic regions, involving an aerial coverage of ca. 500,000 km2. It is subdivided into four sub-provinces, and holds a unique position in global tectonic models for understanding earth's geodynamics and the impact of voluminous eruptions on the contemporary biosystem and climate system. Published stratigraphic data suggest that volcanic eruption took place from 69 to 64 million years (Ma) ago when the Indian plate passed over the Réunion hotspot. The main phase of volcanic activity consisting of about 80% of total basaltic lava, erupted rapidly, during a short span (<1 Ma) or even less (two or three hundred thousand years), close to chron 29R, straddling to the Cretaceous–Paleogene (K–Pg) boundary. Recent high-precision age data show that the main volcanic phase is genetically linked to the Chicxulub impact and plume-head of the hotspot, and largely contributed to the end-Cretaceous mass extinction. To assess the links of the province to the K–Pg boundary, Chicxulub impact, Réunion plume, and Late Cretaceous global climate crisis, it is crucial to have a current state of knowledge of the understanding of its stratigraphy. A review of published data shows a surge in the province research that has considerably advanced the understanding of its stratigraphy. This province is intercalated with numerous infra- and intertrappean sedimentary beds that have yielded diverse biota, providing a reliable relative time control for duration of the volcanic activity. This paper presents a review of the stratigraphic developments of the province (lithostratigraphy, chemostratigraphy, magnetostratigraphy, and chronostratigraphy) from the very beginning to the present, and discusses the role of the Réunion plume in its formation.

印度半岛德干火山省地层学的发展
德干火山省被认为是最大的岩浆区之一,其空中覆盖面积约为50万平方公里。它被细分为四个子省,在了解地球动力学和大规模火山喷发对当代生物系统和气候系统的影响的全球构造模型中占有独特的地位。已发表的地层资料表明,火山爆发发生在6900万至6400万年前,当时印度板块经过r union热点。火山活动的主要阶段约占总玄武岩熔岩的80%,在短时间(1 Ma)或更短时间(二三十万年)内迅速喷发,接近29R,跨越白垩纪-古近纪(K-Pg)边界。最近的高精度年龄数据表明,主要的火山阶段与希克苏鲁伯撞击和热点的羽流有关,并在很大程度上导致了白垩纪末期的大灭绝。为了评估该省与K-Pg边界、希克苏鲁伯撞击、rsamuunion羽流和晚白垩世全球气候危机的联系,了解其地层学的现状至关重要。对已发表数据的回顾显示,该省的研究激增,大大提高了对其地层学的理解。该省分布着大量的陆下和陆间沉积层,这些沉积层产生了多种生物,为火山活动的持续时间提供了可靠的相对时间控制。本文综述了本省自成立至今的地层(岩石地层学、化学地层学、磁地层学和年代学)的发展情况,并讨论了rsamuunion羽在其形成中的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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