苏格兰古元古代大理岩的稳定同位素（C，O，S）记录

IF 0.5 4区地球科学 Q4 GEOLOGY

Scottish Journal of Geology Pub Date : 2023-07-05 DOI:10.1144/sjg2023-009

J. Parnell, A. Boyce, J. Armstrong, A. Schito, D. Muirhead

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引用次数: 0

摘要

古元古代大理石广泛分布于苏格兰西北部。大理岩中的同位素重碳酸盐碳（δ13C>3‰）是世界范围内Lomagundi-Jatuli事件（2.3至2.05 Ga）的特征，在整个喀里多尼亚逆冲带150公里的横断面上，在劳伦阶前陆、莫因纳佩和斯古尔比格纳佩各有发现。轻氧同位素组成区分了可能在拉克斯福德造山运动和喀里多尼亚造山运动期间，由于大气降水的进入而剪切和后退的大理石。弹珠的剪切也有助于石墨的形成（平均δ13C-7.2‰）。大理岩中的黄铁矿含有同位素重硫，这是典型的古元古代成岩硫化物，由低硫酸盐海水沉淀而成。这些数据表明，苏格兰的~2Ga大理石是关于其沉积和沉积后历史的高质量信息档案。这些数据强调了从加拿大东部和格陵兰岛到苏格兰再到斯堪的纳维亚半岛的古元古代大理岩-石墨-硫化物组合的连续性。

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The stable isotope (C,O,S) record of Palaeoproterozoic marbles, Scotland

Palaeoproterozoic marbles occur widely in North West Scotland. The isotopically heavy carbonate carbon (δ 13 C >3 ‰) in marbles that characterizes the worldwide Lomagundi-Jatuli Event (2.3 to 2.05 Ga) is recognized in each of the Laurentian Foreland, the Moine Nappe and the Sgurr Beag Nappe, over a 150 km transect across the Caledonian thrust belt. A light oxygen isotope composition distinguishes marbles which have been sheared and retrogressed by ingress of meteoric water, possibly during both Laxfordian and Caledonian orogenesis. The shearing of marbles also contributed to graphite formation (mean δ 13 C -7.2 ‰). Pyrite in the marbles contains isotopically heavy sulphur, typical of Palaeoproterozoic diagenetic sulphides precipitated from low-sulphate seawater. These data show that the ∼2 Ga marbles in Scotland are a high-quality archive of information on their depositional and post-depositional history. The data emphasize a continuum of a Palaeoproterozoic marble-graphite-sulphide bearing assemblage from Eastern Canada and Greenland through Scotland to Scandinavia.

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来源期刊

Scottish Journal of Geology 地学-地质学

CiteScore

1.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Although published only since 1965, the Scottish Journal of Geology has a long pedigree. It is the joint publication of the Geological Society of Glasgow and the Edinburgh Geological Society, which prior to 1965 published separate Transactions: from 1860 in the case of Glasgow and 1863 for Edinburgh. Traditionally, the Journal has acted as the focus for papers on all aspects of Scottish geology and its contiguous areas, including the surrounding seas. The publication policy has always been outward looking, with the Editors encouraging review papers and papers on broader aspects of the Earth sciences that cannot be discussed solely in terms of Scottish geology. The diverse geology of Scotland continues to provide an important natural laboratory for the study of earth sciences; many seminal studies in geology have been carried out on Scottish rocks, and over the years the results of much of this work had been published in the Journal and its predecessors. The Journal fully deserves its high reputation worldwide and intends to maintain its status in the front rank of publications in the Earth sciences.