印度中部 Vindhyan 超群古新生代 Kajrahat 石灰岩的地球化学:对沉积条件和稀土元素来源的见解

IF 1.1 4区 地球科学 Q3 GEOLOGY
Akanksha Singh, B. P. Singh, S. Kanhaiya, M. A. Quasim, A. Patra, S. Singh, V. K. Srivastava
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引用次数: 0

摘要

下温迪亚(塞姆里)群主要由古近纪未变质和未变形的沉积序列组成。为了推断古环境和 REEs 的来源,对印度中部 Vindhyan 超群的古新生代 Kajrahat 石灰岩进行了详细的地球化学研究。本研究调查了主要、微量和稀土元素(REEs)的地球化学组成。所研究的石灰岩具有较高比例的 CaO(从 30.87 到 48.59 不等),这意味着方解石是这些碳酸盐岩的主要矿物相。二氧化硅是第二大主要氧化物。Sr 是主要的微量元素,与 CaO 呈负相关。与后雅典澳大利亚页岩(PAAS)相比,所有微量元素都出现了贫化。所研究石灰岩的 PAAS 归一化 REE 模式相对统一,LREE 略高于 HREE,Ce 呈负异常。总之,低浓度的 U 和 U/Th 、Ce/Ce* 比值清楚地表明了样品的酸性沉积条件。ΣRREE与SiO2、TiO2和Al2O3呈正相关(r2分别为0.87、0.84和0.91),与CaO呈一周正相关(r2=0.12),表明硅质沉积物也是海水以外的REEs来源。这反过来又表明,这种石灰岩是在沿海/浅海环境中沉积的,其中有一部分来自大陆。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Geochemistry of Palaeoproterozoic Kajrahat Limestone, Vindhyan Supergroup, central India: insights into depositional conditions and sources of rare earth elements

Geochemistry of Palaeoproterozoic Kajrahat Limestone, Vindhyan Supergroup, central India: insights into depositional conditions and sources of rare earth elements

The Lower Vindhyan (Semri) Group substantially consists of unmetamorphosed and undeformed sedimentary sequences of Palaeoproterozoic age. A detailed geochemical study has been carried out to infer the paleoenvironment and the source of REEs for the Palaeoproterozoic Kajrahat Limestone, Vindhyan Supergroup, Central India. This study investigates the geochemical composition of major, trace and rare earth elements (REEs). The studied limestones, have a high percentage of CaO (ranging from 30.87 to 48.59) implies that calcite was the primary mineral phase in these carbonates. SiO2 is second most abundant major oxide. Sr is dominant trace element showing a negative correlation with CaO. All trace elements exhibit depletion with respect to Post-Archean Australian Shale (PAAS). The PAAS-normalized REE pattern of studied limestone has a relatively uniform pattern, with slightly enriched LREE compared to HREE with negative Ce anomaly. Collectively, low concentration of U and U/Th, Ce/Ce* ratios clearly indicates an oxic depositional condition for the samples. The ΣREE shows a positive correlation with SiO2, TiO2 and Al2O3 (r2 = 0.87, 0.84and 0.91 respectively) and a week positive correlation with CaO (r2 = 0.12) suggested that siliciclastic sediments also serve as a source for the REEs beside seawater. This, in turn, indicates that the deposition of this limestone occurred in a coastal/shallow marine environment with some contribution from continental part.

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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
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