U–Pb zircon geochronology of the Proterozoic siliciclastic stratal succession of the Kumaun Lesser Himalaya: Implications for regional stratigraphic correlation

IF 1.3 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Journal of Earth System Science Pub Date : 2024-05-27 DOI:10.1007/s12040-024-02309-z

Poonam Jalal, Sumit K Ghosh, Mohit Puniya, Gajender Kumar

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Abstract

The siliciclastics make the major part of the Proterozoic Kumaun Lesser Himalaya region. These share similar appearance, sedimentology, and petrography. In the absence of fossils and any other age constraint, these are named differently in literature, i.e., Nagthat, Bhowali, Lariakantha, and Berinag quartzites, based on their locality, sedimentological and petrographical characteristics. Their stratal disposition and their regional correlation are always debatable. The present work addresses the stratal disposition of these Proterozoic siliciclastics using the detrital zircon (DZ) U–Pb geochronology. The study suggests that the siliciclastics of Bhowali, Lariakantha, Nagthat and Berinag in the Kumaun region are equivalent and show the maximum depositional age (MDA) of ~1850 Ma. However, the Nagthat Formation in Garhwal Lesser Himalaya has a Neoproterozoic DZ depositional age (~850 Ma) and is a different identity. This study suggests that in the Kumaun Lesser region (inner and outer), only Palaeoproterozoic siliciclastic is present. Also, they can be grouped under Berinag with its implications about the inner and outer Lesser Himalayan division and the relationship with younger strata of Blaini Formation.

Research highlights

U-Pb Detrital zircon geochronology from siliciclastics, Kumaun Lesser Himalaya (inner and outer) region
Only Palaeoproterozoic detrital zircon ages for Kumaun Lesser region (both inner (ILH) and outer (OLH))
Continuous Paleoproterozoic sedimentation in a single basin

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库马恩小喜马拉雅山新生代硅质岩地层演替的U-Pb锆石地质年代学：对区域地层关联的影响

摘要硅质岩构成了新生代库曼小喜马拉雅地区的主要部分。它们具有相似的外观、沉积学和岩相学。由于缺乏化石和其他任何年龄限制因素，文献根据它们的地点、沉积学和岩相学特征对它们进行了不同的命名，即 Nagthat、Bhowali、Lariakantha 和 Berinag 石英岩。它们的地层分布及其区域相关性一直存在争议。本研究利用碎屑锆石（DZ）U-Pb 地球地质年代学研究了这些新生代硅质岩的地层分布。研究表明，库马恩地区的Bhowali、Lariakantha、Nagthat和Berinag硅质岩相等同，最大沉积年龄（MDA）约为1850Ma。然而，小喜马拉雅山脉加瓦尔地区的 Nagthat 地层具有新近新生代 DZ 沉积年龄（约 850 Ma），是一个不同的身份。这项研究表明，在库马恩小喜马拉雅地区（内部和外部），只存在古新生代硅质碎屑岩。研究重点库马恩小喜马拉雅山（内、外）地区硅碎屑岩的锆石地质年代U-Pb锆石碎屑岩地质年代库马恩小喜马拉雅山（内、外）地区只有古生代锆石碎屑岩地质年代（内（ILH）和外（OLH））单一盆地的连续古生代沉积作用

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来源期刊

Journal of Earth System Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.20

自引率

5.30%

发文量

226

期刊介绍： The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’. The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria. The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region. A model study is carried out to explain observations reported either in the same manuscript or in the literature. The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.

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