کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6427647 1634721 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Late Triassic paleogeographic reconstruction along the Neo-Tethyan Ocean margins, southern Tibet
ترجمه فارسی عنوان
بازسازی پالئوگوگرافی تایلند در امتداد حوضه های نئو تتیان در جنوب تبت
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علوم زمین و سیاره ای (عمومی)
چکیده انگلیسی


- Upper Triassic strata record early Mesozoic paleogeography of Neo-Tethyan margins.
- Langjiexue Fm. was deposited on India's margin and was sourced from West Papua.
- Nieru Fm. near Lazi is typical of the Indian craton derived Tethyan Himalaya Sequence.
- Nieru Fm. near Kangma are similar to the Upper Triassic strata in NW Australia.
- Mailonggang Fm. was separated from Greater India by the Neo-Tethyan Ocean.

Sandstone petrographic and U-Pb detrital zircon analyses of Upper Triassic sedimentary rocks from the northern margin of India (Tethyan Himalaya Sequence) and southern margin of Eurasia (Lhasa terrane) provide new constraints on the Mesozoic paleogeography of Neo-Tethyan Ocean basins. The Upper Triassic Nieru Formation of the Tethyan Himalaya Sequence (THS) near Lazi city (∼29°N, 87.5°E) is dominated by Indian-affinity, Precambrian detrital zircons, which are typical of the majority of the THS. However, the Upper Triassic Langjiexue Formation of the THS exposed to the east (at 90-93°E longitude) includes significant populations of Permian to Early Jurassic (291-184 Ma) detrital zircons for which there is no known Indian source. In addition, the Upper Triassic Nieru Formation near Kangma town (∼28.5°N, 90°E), located ∼200 km to the southeast of Lazi city, yielded detrital zircon age spectra that are similar to those of Langjiexue Formation. Based on detrital zircon age spectra comparisons, we propose that both the Langjiexue and Nieru formations were derived from continental crustal fragments that were adjacent to the northwestern margin of Australia. Furthermore, we suggest that these THS units, and age-equivalent strata in Northwest Australia, West Sulawesi, Timor and West Papua, comprised a Late Triassic submarine fan along the northern Australian shelf. The Upper Triassic Mailonggang Formation in the southern Lhasa terrane (35 km northeast of Lhasa city, ∼30°N, 91.5°E) is dominated by Permian detrital zircons, which were likely derived from proximal Lhasa terrane sources. The Mailonggang Formation differs from all age-equivalent strata in the Tethyan Himalaya; therefore we interpret that it was separated from Greater India by the Neo-Tethyan Ocean.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Earth and Planetary Science Letters - Volume 435, 1 February 2016, Pages 105-114
نویسندگان
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