Major element compositions of fluid inclusions from hydrothermal vein-type deposits record eroded sedimentary units in the Schwarzwald district, SW Germany
Major element compositions of fluid inclusions from hydrothermal vein-type deposits record eroded sedimentary units in the Schwarzwald district, SW Germany
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德国西南部黑森林地区热液脉型沉积物记录侵蚀沉积单元的流体包裹体的主要元素组成
DOI:
10.1007/s00126-017-0719-7
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发表时间:
2017
影响因子:
4.8
通讯作者:
Burisch
中科院分区:
文献类型:
--
作者:
Walter;Burisch
Mixing of sedimentary formation fluids with basement-derived brines is an important mechanism for the formation of hydrothermal veins. We focus on the sources of the sediment-derived fluid component in ore-forming processes and present a comprehensive fluid inclusion study on 84 Jurassic hydrothermal veins from the Schwarzwald mining district (SW Germany). Our data derive from about 2300 fluid inclusions and reveal differences in the average fluid composition between the northern, central, and southern Schwarzwald. Fluids from the northern and southern Schwarzwald are characterised by high salinities (18–26 wt% NaCl+CaCl2), low Ca/(Ca+Na) mole ratios (0.1–0.4), and variable Cl/Br mass ratios (30–1140). In contrast, fluids from the central Schwarzwald show even higher salinities (23–27 wt% NaCl+CaCl2), higher Ca/(Ca+Na) mole ratios (0.2–0.9), and less variable Cl/Br mass ratios (40–130). These fluid compositions correlate with the nature and thickness of the now eroded sedimentary cover rocks. Compared to the northern and the southern Schwarzwald, where halite precipitation occurred during the Middle Triassic, the sedimentary basin in the central Schwarzwald was relatively shallow at this time and no halite was precipitated. Accordingly, Cl/Br ratios of fluids from the central Schwarzwald provide no evidence for the reaction of a sedimentary brine with halite, whereas those from the northern and southern Schwarzwald do. Instead, elevated Ca/(Ca+Na), high SO4contents, and relatively low Cl/Br imply the presence of a gypsum dissolution brine during vein formation in the central Schwarzwald which agrees with the reconstructed regional Triassic geology. Hence, the information archived in fluid inclusions from hydrothermal veins in the crystalline basement has the potential for reconstructing sedimentary rocks in the former overburden.
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影响因子:
2.1
作者:
V. Lueders;P. Moeller
通讯作者:
P. Moeller
影响因子:
3.9
作者:
M. Boiron;M. Cathelineau;D. Banks;S. Buschaert;S. Fourcade;Y. Coulibaly;J. Michelot;A. Boyce
通讯作者:
A. Boyce
DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
J. Hoeve;T. Sibbald
通讯作者:
T. Sibbald
影响因子:
3.4
作者:
I. Stober;K. Bucher
通讯作者:
K. Bucher
影响因子:
3.9
作者:
B. Walter;A. Immenhauser;A. Geske;G. Markl
通讯作者:
B. Walter;A. Immenhauser;A. Geske;G. Markl