DOI: 10.5194/cp-14-369-2018
Scopus记录号: 2-s2.0-85043988837
论文题名: Palaeoclimate significance of speleothems in crystalline rocks: A test case from the Late Glacial and early Holocene (Vinschgau, northern Italy)
作者: Koltai G. ; Cheng H. ; Spötl C.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期: 3 起始页码: 369
结束页码: 381
语种: 英语
Scopus关键词: climate conditions
; crystalline rock
; groundwater
; Holocene
; isotopic fractionation
; Last Glacial
; mineralogy
; oxygen isotope
; paleoclimate
; speleothem
; stable isotope
; Bolzano
; Italy
; Trentino-Alto Adige
; Venosta Valley
英文摘要: Partly coeval flowstones formed in fractured gneiss and schist were studied to test the palaeoclimate significance of this new type of speleothem archive on a decadal-to-millennial timescale. The samples encompass a few hundred to a few thousand years of the Late Glacial and the early Holocene. The speleothem fabric is primarily comprised of columnar fascicular optic calcite and acicular aragonite, both indicative of elevated MggCa ratios in the groundwater. Stable isotopes suggest that aragonite is more prone to disequilibrium isotope fractionation driven by evaporation and prior calcite/aragonite precipitation than calcite. Changes in mineralogy are therefore attributed to these two internal fracture processes rather than to palaeoclimate. Flowstones formed in the same fracture show similar 18O changes on centennial scales, which broadly correspond to regional lacustrine 18O records, suggesting that such speleothems may provide an opportunity to investigate past climate conditions in non-karstic areas. The shortness of overlapping periods in flowstone growth and the complexity of in-aquifer processes, however, render the establishment of a robust stacked 18O record challenging. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109582
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Institute of Geology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria; Xi'An Jiaotong University, Institute of Global Environmental Change, 28 Xianning West Road, Xi'an, Shaanxi, 710049, China
Recommended Citation:
Koltai G.,Cheng H.,Spötl C.. Palaeoclimate significance of speleothems in crystalline rocks: A test case from the Late Glacial and early Holocene (Vinschgau, northern Italy)[J]. Climate of the Past,2018-01-01,14(3)