کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4747068 1359886 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Geochemistry and detrital zircon U–Pb dating of Lower Cretaceous volcaniclastics in the Babazhadong section, Northern Tethyan Himalaya: Implications for the breakup of Eastern Gondwana
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فسیل شناسی
پیش نمایش صفحه اول مقاله
Geochemistry and detrital zircon U–Pb dating of Lower Cretaceous volcaniclastics in the Babazhadong section, Northern Tethyan Himalaya: Implications for the breakup of Eastern Gondwana
چکیده انگلیسی


• Reporting geochemical data of the volcaniclastic sandstones (K1) in southern Tibet.
• Comparing the volcaniclastic sandstones outcropped along the length of the Himalayas.
• The relative volcanic activities occurred in an extensional intra-plate setting.
• Supplementing the geodynamic model causing the extensive volcanic events.

Lower Cretaceous volcaniclastic sandstones, widely distributed in the Tethyan Himalaya, provide insights into evolution of the Tethyan Himalaya and the continental breakup of Eastern Gondwana. Here we present the petrological, geochronological and geochemical data from the Lower Cretaceous volcaniclastic sandstones at the Babazhadong section, eastern Tethyan Himalaya. The geochronological data show that the youngest detrital zircons in the lowest volcaniclastic sandstones have U–Pb age of (134 ± 4 Ma), therefore were deposited post late Valanginian. The volcaniclastics are predominantly comprised by mafic detritus in the lower part, while felsic grains become more abundant up-section. The proportion of volcaniclastics in the sandstones also increases upwards. Geochemical data of mafic detritus indicate within-plate basalt affinity. Based on these observations, in combination with the stratigraphic correlation of coeval volcaniclastic sandstones deposited along the length of the Himalayas, we conclude that the volcaniclastics in the Babazhadong area are within-plate affinity, probably related to the opening of deep, crust cross-cutting fractures along the northern margin of Greater India.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Cretaceous Research - Volume 52, Part A, January 2015, Pages 127–137
نویسندگان
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