A modern pulse of ultrafast exhumation and diachronous crustal melting in the Nanga Parbat Massif.

Autor:	Guevara VE; Geology Department, Amherst College, 220 South Pleasant Street, Amherst, MA 01002, USA., Smye AJ; Department of Geosciences, Pennsylvania State University, 332 Deike Building, University Park, PA 16802, USA., Caddick MJ; Department of Geosciences, Virginia Tech, 4044 Derring Hall, 926 W. Campus Drive, Blacksburg, VA 24061, USA., Searle MP; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK.; Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, UK., Olsen T; Geology Department, Western Washington University, 516 High Street, Bellingham, WA 98225, USA., Whalen L; Department of Geosciences, Virginia Tech, 4044 Derring Hall, 926 W. Campus Drive, Blacksburg, VA 24061, USA., Kylander-Clark ARC; Department of Earth Science, University of California, Santa Barbara, 1006 Webb Hall, Santa Barbara, CA 93106, USA., Jercinovic MJ; Department of Geosciences, University of Massachusetts, 627 North Pleasant Street, Amherst, MA 01003, USA., Waters DJ; Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK.; Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, UK.
Jazyk:	angličtina
Zdroj:	Science advances [Sci Adv] 2022 Aug 05; Vol. 8 (31), pp. eabm2689. Date of Electronic Publication: 2022 Aug 05.
DOI:	10.1126/sciadv.abm2689
Abstrakt:	We combine monazite petrochronology with thermal modeling to evaluate the relative roles of crustal melting, surface denudation, and tectonics in facilitating ultrafast exhumation of the Nanga Parbat Massif in the western Himalayan syntaxis. Our results reveal diachronous melting histories between samples and a pulse of ultrafast exhumation (9 to 13 mm/year) that began ~1 Ma and was preceded by several million years of slower, but still rapid, exhumation (2 to 5 mm/year). Recent studies show that an exhumation pulse of similar timing and magnitude occurred in the eastern Himalayan syntaxis. A synchronous exhumation pulse in both Himalayan syntaxes suggests that neither erosion by rivers and/or glaciers nor a pulse of crustal melting was a primary trigger for accelerated exhumation. Rather, our results, combined with those of recent studies in the eastern syntaxis, imply that larger-scale tectonic processes impose the dominant control on the current tempo of rapid exhumation in the Himalayan syntaxes.
Databáze:	MEDLINE
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