globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116586
论文题名:
Linking orogeny and orography in the Southern Alps of New Zealand: New observations from detrital fission-track thermochronology of the Waiho-1 borehole
作者: Lang K.A.; Glotzbach C.; Ring U.; Kamp P.J.J.; Ehlers T.A.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 552
语种: 英语
中文关键词: detrital ; erosion ; exhumation ; Southern Alps ; tectonics ; thermochronology
英文关键词: Boreholes ; Deformation ; Faulting ; Inverse problems ; Numerical models ; Phosphate minerals ; Rain ; Silicate minerals ; Zircon ; Convergent plate boundaries ; Detrital thermochronology ; Orographic precipitation ; Orographic rain shadows ; Paleoclimatic record ; Plate reconstruction ; Precipitation patterns ; Zircon fission tracks ; Fission reactions ; borehole ; computer simulation ; crustal deformation ; detrital deposit ; exhumation ; fission track dating ; numerical model ; orogeny ; orography ; plate convergence ; tectonic reconstruction ; tectonic setting ; thermochronology ; New Zealand ; South Island ; Southern Alps
英文摘要: Numerical modeling coupling erosion with crustal deformation predicts that development of an orographic rain shadow may explain the asymmetric exhumation of convergent plate boundary orogens. This prediction is consistent with observations from the Southern Alps of New Zealand, where bedrock thermochronology indicates crustal exhumation has been concentrated along the wet, windward side of the mountains. While the spatial correspondence of exhumation and precipitation patterns is compelling, a robust evaluation of the link between orographic and orogenic processes further requires a temporal comparison between exhumation history, plate reconstructions and paleoclimatic records. We present a detailed exhumation history of the Southern Alps from detrital apatite and zircon fission-track thermochronology of the Waiho-1 borehole, a 3.6 km-thick sequence of proximal foreland basin sediments. Inverse thermal modeling of a 2062-grain dataset predicts two periods of rapid exhumation in the Early and Late Miocene. Rapid exhumation in the Early Miocene was synchronous with the development of transpression along the Alpine Fault and a ca. 20–22 Ma pulse of exhumation may reflect cooling during inversion of preexisting extensional basins. Rapid exhumation in the Late Miocene was not synchronous with a discrete change in plate convergence but increased exhumation rates after 7.4 Ma may instead reflect localization of plate boundary deformation along the Alpine Fault as orographic precipitation concentrated exhumation in the Alpine Fault hanging wall. We propose that, similar to prior interpretations from bedrock thermochronology, detrital thermochronology of the Southern Alps foreland basin is consistent with numerical model predictions linking asymmetric exhumation of the orogen to the growth of an orographic rain shadow. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165094
Appears in Collections:气候变化与战略

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作者单位: Department of Geological Sciences, Stockholm University, Stockholm, Sweden; Department of Geosciences, University of Tübingen, Tübingen, Germany; School of Science, The University of Waikato, Hamilton, New Zealand

Recommended Citation:
Lang K.A.,Glotzbach C.,Ring U.,et al. Linking orogeny and orography in the Southern Alps of New Zealand: New observations from detrital fission-track thermochronology of the Waiho-1 borehole[J]. Earth and Planetary Science Letters,2020-01-01,552
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