Fracture dolomite as an archive of continental palaeo-environmental conditions

被引：22

作者：

Baldermann, Andre ^{[1
,2
]}

Mittermayr, Florian ^{[3
]}

Bernasconi, Stefano M. ^{[4
]}

Dietzel, Martin ^{[1
,2
]}

Grengg, Cyrill ^{[1
,2
]}

Hippler, Dorothee ^{[1
,2
]}

Kluge, Tobias ^{[5
]}

Leis, Albrecht ^{[6
]}

Lin, Ke ^{[7
,8
]}

Wang, Xianfeng ^{[7
,8
]}

Zuenterl, Andrea ^{[1
,2
,9
]}

Boch, Ronny ^{[1
,2
,9
]}

机构：

[1] Graz Univ Technol, Inst Appl Geosci, Rechbauerstr 12, A-8010 Graz, Austria

[2] Graz Univ Technol, NAWI Graz Geoctr, Rechbauerstr 12, A-8010 Graz, Austria

[3] Graz Univ Technol, Inst Technol & Testing Bldg Mat, Inffeldgasse 24, A-8010 Graz, Austria

[4] Swiss Fed Inst Technol, Geol Inst, Sonneggstr 5, CH-8092 Zurich, Switzerland

[5] Heidelberg Univ, Inst Environm Phys, Neuenheimer Feld 229, D-69120 Heidelberg, Germany

[6] JR AquaConSol GmbH, Steyrergasse 21, A-8010 Graz, Austria

[7] Nanyang Technol Univ, Earth Observ Singapore, 50 Nanyang Ave, Singapore 639798, Singapore

[8] Nanyang Technol Univ, Asian Sch Environm, 50 Nanyang Ave, Singapore 639798, Singapore

[9] Geoconsult ZT GmbH, Team Geochem & Monitoring, Holzlstr 5, A-5071 Salzburg, Austria

来源：

COMMUNICATIONS EARTH & ENVIRONMENT | 2020年 / 1卷 / 01期

基金：

新加坡国家研究基金会;

关键词：

CLUMPED-ISOTOPE; CARBONATE FORMATION; MG-CALCITE; ARAGONITE; TEMPERATURE; CAVE; GEOCHEMISTRY; FLUIDS; GROWTH; BASIN;

D O I：

10.1038/s43247-020-00040-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The origin of Quaternary dolomites in continental environments (e.g. karst and lakes) is barely constrained compared to marine dolomites in sedimentary records. Here we present a study of dolomite and aragonite formations infilling young fractures of the 'Erzberg' iron ore deposit, Austria, under continental-meteoric and low temperature conditions. Two dolomite generations formed shortly after the Last Glacial Maximum (similar to 20 kyr BP): dolomite spheroids and matrix dolomite. Clumped isotope measurements and U/Th disequilibrium ages reveal formation temperatures of 0-3 degrees C (+/- 6 degrees C) and 3-20 degrees C (+/- 5 degrees C) for the both dolomite types, and depositional ages around 19.21 +/- 0.10 kyr BP and 13.97 +/- 0.08 kyr BP or younger, respectively. Meteoric solution and carbonate isotope compositions (delta O-18, delta C-13 and Sr-87/Sr-86) indicate the dolomites formed via aragonite and high-Mg calcite precursors from CO2-degassed, Mg-rich solutions. Our study introduces low temperature dolomite formations and their application as a sedimentary-chemical archive. Palaeo-environmental conditions can be recorded in low-temperature continental archives, according to geochemical and isotopic analyses of dolomitic fracture infills at Erzberg, Austria

引用

页数：12

共 73 条

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