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Trace-element and Nd-isotope systematics in detrital apatite of the Po river catchment: Implications for provenance discrimination and the lag-time approach to detrital thermochronology

文献类型：期刊论文

作者Malusa, Marco G.1; Wang, Jiangang2; Garzanti, Eduardo1; Liu, Zhi-Chao2,3; Villa, Igor M.1,4; Wittmann, Hella5
刊名LITHOS
出版日期2017-10-01
卷号290页码:48-59
关键词Detrital apatite Mineral fertility Trace elements Nd isotopes Be-10-derived erosion rates Lag-time analysis
ISSN号0024-4937
DOI10.1016/j.lithos.2017.08.006
文献子类Article
英文摘要Detrital thermochronology is often employed to assess the evolutionary stage of an entire orogenic belt using the lag-time approach, i.e., the difference between the cooling and depositional ages of detrital mineral grains preserved in a stratigraphic succession. The impact of different eroding sources to the final sediment sink is controlled by several factors, including the short-term erosion rate and the mineral fertility of eroded bedrock. Here, we use apatite fertility data and cosmogenic-derived erosion rates in the Po river catchment (Alps-Apennines) to calculate the expected percentage of apatite grains supplied to the modern Po delta from the major Alpine and Apenninic eroding sources. We test these predictions by using a cutting-edge dataset of trace-element and Nd-isotope signatures on 871 apatite grains from 14 modern sand samples, and we use apatite fission-track data to validate our geochemical approach to provenance discrimination. We found that apatite grains shed from different sources are geochemically distinct. Apatites from the Lepontine dome in the Central Alps show relative HREE enrichment, lower concentrations in Ce and U, and higher Sm-147/Nd-144 ratios compared to apatites derived from the External Massifs. Derived provenance budgets point to a dominant apatite contribution to the Po delta from the high-fertility Lepontine dome, consistent with the range independently predicted from cosmonuclide and mineral-fertility data. Our results demonstrate that the single-mineral record in the final sediment sink can be largely determined by high-fertility source rocks exposed in rapidly eroding areas within the drainage. This implies that the detrital thermochronology record may reflect processes affecting relatively small parts of the orogenic system under consideration. A reliable approach to lag-time analysis would thus benefit from an independent provenance discrimination of dated mineral grains, which may allow to proficiently reconsider many previous interpretations of detrital thermochronology datasets in terms of orogenic-wide steady state. (C) 2017 Elsevier B.V. All rights reserved.
WOS关键词U-PB GEOCHRONOLOGY ; FISSION-TRACK ; EUROPEAN ALPS ; WESTERN ALPS ; EXHUMATION ; EROSION ; ZIRCON ; RECORD ; PATTERNS ; BASIN
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000413390700004
出版者ELSEVIER SCIENCE BV
资助机构DFG Project(WI 3874/3-1) ; DFG Project(WI 3874/3-1) ; DFG Project(WI 3874/3-1) ; DFG Project(WI 3874/3-1)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62003]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Malusa, Marco G.; Wang, Jiangang
作者单位1.Univ Milano Bicocca, Dept Earth & Environm Sci, Milan, Italy
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
3.Sun Yat Sen Univ, Guangzhou, Guangdong, Peoples R China
4.Univ Bern, Inst Geol Sci, Bern, Switzerland
5.GFZ German Res Ctr Geosci, Potsdam, Germany
推荐引用方式
GB/T 7714		 Malusa, Marco G.,Wang, Jiangang,Garzanti, Eduardo,et al. Trace-element and Nd-isotope systematics in detrital apatite of the Po river catchment: Implications for provenance discrimination and the lag-time approach to detrital thermochronology[J]. LITHOS,2017,290:48-59.
APA Malusa, Marco G.,Wang, Jiangang,Garzanti, Eduardo,Liu, Zhi-Chao,Villa, Igor M.,&Wittmann, Hella.(2017).Trace-element and Nd-isotope systematics in detrital apatite of the Po river catchment: Implications for provenance discrimination and the lag-time approach to detrital thermochronology.LITHOS,290,48-59.
MLA Malusa, Marco G.,et al."Trace-element and Nd-isotope systematics in detrital apatite of the Po river catchment: Implications for provenance discrimination and the lag-time approach to detrital thermochronology".LITHOS 290(2017):48-59.

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来源：地质与地球物理研究所

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