کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4727149 1356363 2012 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The vast proto-Tibetan Plateau: New constraints from Paleogene Hoh Xil Basin
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
The vast proto-Tibetan Plateau: New constraints from Paleogene Hoh Xil Basin
چکیده انگلیسی

The surface uplift of the Tibetan Plateau is the key boundary condition in many Cenozoic geological events ranging from global cooling to changes of Asian environments during Cenozoic. However, poorly constrained timing for the uplift of Tibetan Plateau makes these interpretations highly debatable. Here we report results from sedimentology, detrital zircon U–Pb and Lu–Hf isotopic compositions, and paleomagnetic signatures from both the eastern and western Hoh Xil basins of north-central Tibetan Plateau. Sedimentary lithofacies and facies associations analyzed in the western Hoh Xil basin indicate they were deposited in a braided fluvial system and alluvial fan, similar with the Fenghuoshan Group, eastern Hoh Xil basin. Provenance analyses from conglomerate clast compositions, paleocurrent orientations, and detrital zircon U–Pb and Lu–Hf isotopic compositions document sediments in both western and eastern basins were derived from the Qiangtang and Lhasa blocks. These observations, in combination with comparative paleomagnetic results, imply that Hoh Xil basin was a single, wide basin during Paleogene. The period of Hoh Xil basin deposition was coeval with significant period of the early Cenozoic uplift and erosion of the Qiangtang and Lhasa blocks. These observations not only reinforce the suggestion that the Qiangtang and Lhasa blocks were uplifted during Eocene to form a proto-Tibetan Plateau, but also imply that the proto-Tibet Plateau is vast in areal extent. The large dimension and high elevation of the proto-Tibetan Plateau probably contributed to the global cooling during the early Eocene.

Figure optionsDownload as PowerPoint slideHighlights
► Sedimentology, detrital zircon U–Pb and Hf isotope, paleomagnetism to Hoh Xil basin.
► A wide Paleogene Hoh Xil basin response to the uplift of proto-Tibetan Plateau.
► The vast proto-Tibetan Plateau probably contributed to late Cenozoic global cooling.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Gondwana Research - Volume 22, Issue 2, September 2012, Pages 434–446
نویسندگان
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