意大利皮埃蒙特盆地墨西尼亚期蒸发岩硫酸盐同位素组成

Q4 Earth and Planetary Sciences

Geogaceta Pub Date : 2023-10-31 DOI:10.55407/geogaceta102282

Javier García-Veigas, Luis Gibert, Dioni I. Cendón, Francesco Dela Pierre, Marcello Natalicchio, David Artiaga

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引用次数: 1

摘要

Piedmont盆地(意大利西北部)记录了一个迈西尼亚盐危机(MSC)序列，包括一个亚硒酸盐石膏矿床，属于初级下石膏(PLG, MSC第1阶段)。锶同位素比值在地中海地区PLG矿床的范围内。序列下部垂向亚硒酸盐石膏层的硫酸盐同位素组成与其他PLG矿床相似。而上部亚硒酸盐锥呈扁平分支状，同位素组成较高，主要为δ34S值，表明BSR条件较强，较其他PLG矿床强。我们将PLG上部沉积期间的化学变化解释为亚平宁和阿尔卑斯隆升期间该盆地在亚得里亚湾的边缘位置所辅助的海洋限制增加的结果。

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Sulfate isotope composition of Messinian evaporites in the Piedmont basin (Italy)

The Piedmont basin (NW Italy) records a Messinian Salinity Crisis (MSC) succession including a selenite gypsum deposit assigned to the Primary Lower Gypsum (PLG, MSC stage 1). Strontium isotope ratios are in the range of the PLG deposits of the Mediterranean area. Sulfate isotope compositions of vertically oriented selenite gypsum beds, in the lower part of the succession, are similar to those reported in other PLG deposits. However, flattened branching selenite cones in the upper part show higher isotope compositions, mainly in δ34S values, suggesting intense BSR conditions, stronger than reported in other PLG deposits. We interpret this chemical shift during deposition of the upper part of the PLG as the result of increased marine restriction assisted by the marginal position of this basin in the Adriatic Gulf during the Apennine and Alpine uplifts.

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来源期刊

Geogaceta Earth and Planetary Sciences-Geology

CiteScore

0.40

自引率

0.00%

发文量

期刊介绍： Geogaceta is a magazine that publishes semiannually the Geological Society of Spain. This society aims to promote, promote, and disseminate knowledge, progress and applications of Geology; , the advice in scientific and educational matters to the institutions and entities that require it and the representation of the scientific interests of the geological community of Spain at international level. Its members have the right to participate in all the activities organized by the Company, to present their candidacy to any of their management positions and to receive free periodical publications of the Company (Geogaceta and Magazine of the Geological Society of Spain).