干旱区生态环境知识资源中心(Arid): Neogene basin infilling from cosmogenic nuclides (Be-10 and Ne-21) in Atacama, Chile: Implications for palaeoclimate and supergene copper mineralization

Arid

DOI	10.1111/bre.12568
	Neogene basin infilling from cosmogenic nuclides (Be-10 and Ne-21) in Atacama, Chile: Implications for palaeoclimate and supergene copper mineralization
	Sanchez, Caroline; Regard, Vincent; Carretier, Sebastien; Riquelme, Rodrigo; Blard, Pierre-Henri; Campos, Eduardo; Brichau, Stephanie; Lupker, Maarten; Herail, Gerard
通讯作者	Regard, V (corresponding author), Univ Toulouse, Geosci Environm Toulouse, CNRS, IRD,UPS, 14 Ave Edouard Belin, F-31400 Toulouse, France.
来源期刊	BASIN RESEARCH
ISSN	0950-091X
EISSN	1365-2117
出版年	2021
卷号	33 期号:5 页码:2549-2571
英文摘要	Increasing evidence suggests that supergene exotic copper deposits were emplaced during periods of geomorphic quiescence and pulses of humidity in arid environments. We tested this idea in the Centinela Mining District in the Atacama Desert (northern Chile). We collected 14 sand samples at depth (up to 110 m) in two open-pit mines (Central Tesoro and Mirador) exposing Miocene sediment, and located in the El Tesoro Basin, which hosts two exotic copper-rich orebodies. We inverted the Be-10 and Ne-21 concentrations by using a two-box model (IMIS, inversion of multi-isotopes in a sedimentary basin) composed of an eroding source of sediment and a depositional sedimentary basin, and by selecting denudation and sedimentation rate histories that can explain our data. The ages found demonstrate that the two exotic orebodies were deposited during a narrow period between 14 Ma (10 Ma younger than previously thought) and 9.5 Ma, when an ignimbrite covered the sedimentary sequence. The dated lower exotic copper orebody was deposited during or just before a sharp decrease in the sedimentation rates (from >100 to 0.5-5 m/Ma), which is consistent with published sedimentological and carbonate isotopic data in this district. This confirms the idea that exotic deposits form during a quiescence of the geomorphic activity. Nevertheless, our model suggests that the back-ground denudation rate providing sediment to these basins between ca. 14 Ma and ca. 9.5 Ma was surprisingly high (>250 m/Ma) for such an arid environment. These denudation rates can be explained by a relatively rapid local back-scarp retreat providing most of the sediment to these basins and possibly a wetter climate compared to the present. Then, during the period 10-7 Ma, the denudation rates decreased to >50 m/Ma. This decrease may correspond to a local progressive decrease in the slope of the surrounding hills, or to a progressive aridification, or a combination of both phenomena.
英文关键词	Atacama burial dating cosmogenic nuclides denudation rates intramountainous basin supergene copper deposits
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000663855000001
WOS关键词	NORTHERN CHILE ; DENUDATION RATES ; LANDSCAPE EVOLUTION ; HYPERARID ATACAMA ; CLIMATE-CHANGE ; MIOCENE AGE ; DESERT ; EROSION ; RADIONUCLIDES ; UPLIFT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	French National Research Institute for Sustainable Development ; E17
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352084
作者单位	[Sanchez, Caroline; Regard, Vincent; Carretier, Sebastien; Brichau, Stephanie; Herail, Gerard] Univ Toulouse, Geosci Environm Toulouse, CNRS, IRD,UPS, 14 Ave Edouard Belin, F-31400 Toulouse, France; [Riquelme, Rodrigo; Campos, Eduardo] Univ Catolica Norte, Dept Ciencias Geol, Antofagasta, Chile; [Blard, Pierre-Henri] Univ Lorraine, Ctr Rech Petrograph & Geochim, CRPG UMR 7358, CNRS, Vandoeuvre Les Nancy, France; [Lupker, Maarten] ETH, Geol Inst, Zurich, Switzerland
推荐引用方式 GB/T 7714	Sanchez, Caroline,Regard, Vincent,Carretier, Sebastien,et al. Neogene basin infilling from cosmogenic nuclides (Be-10 and Ne-21) in Atacama, Chile: Implications for palaeoclimate and supergene copper mineralization[J]. French National Research Institute for Sustainable Development, E17,2021,33(5):2549-2571.
APA	Sanchez, Caroline.,Regard, Vincent.,Carretier, Sebastien.,Riquelme, Rodrigo.,Blard, Pierre-Henri.,...&Herail, Gerard.(2021).Neogene basin infilling from cosmogenic nuclides (Be-10 and Ne-21) in Atacama, Chile: Implications for palaeoclimate and supergene copper mineralization.BASIN RESEARCH,33(5),2549-2571.
MLA	Sanchez, Caroline,et al."Neogene basin infilling from cosmogenic nuclides (Be-10 and Ne-21) in Atacama, Chile: Implications for palaeoclimate and supergene copper mineralization".BASIN RESEARCH 33.5(2021):2549-2571.