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New GSA Bulletin articles published ahead of print in August

New GSA Bulletin articles published ahead of print in August
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United States , Ping Zheng , La Conception , New Caledonia General , New Caledonia , China General , Hong Zhong , New Zealand , Xiaohan Dong , Chen Wu , Shili Peng , New Zealand General , Jun Chen , Jin Zhang , Tibetan Plateau , Dominicp Strogen , Wenjiao Xiao , Dyuti Prakash Sarkar , Earlef Mcbride , Zhiguang Zhou , Petera Cawood , A Bing Lin , Ma Emeishan , Xing Chun Zhang , Kaushik Das , Liang Liu ,

"The tectonic evolution of the Dras-Nindam Terrane, Ladakh Himalaya, NW" by Jessica Margaret June Walsh

Unravelling the tectonic processes responsible for the uplift of the Himalaya requires in-depth investigation of individual terranes caught up along the Indus Suture Zone that separates the continents of India and Eurasia. The Himalayan Orogen represent the complex amalgamation of, not only the two colliding continents with one plate subducting underneath the other, but also fragments of oceanic crust (ophiolites) and intraoceanic arcs that developed within the vast expanse of the now extinct Neotethyan Ocean. The aim of this thesis was to resolve the tectonic evolution of the Dras-Nindam terrane in the Ladakh Himalaya using standard geological mapping, geochemistry and sophisticated zircon U-Pb geochronology. The Dras-Nindam terrane is sandwiched between Indian and Eurasian continental crust along the Indus Suture Zone in the Ladakh Himalaya, NW India. This tectonostratigraphic unit includes basaltic to andesitic rocks of the Dras Volcanics and associated deep marine, volcaniclastic r ....

Jammu And Kashmir , Neotethyan Ocean , Indus Suture Zone , Himalayan Orogen , Ladakh Himalaya , Dras Volcanics , Ladakh Arc , Nindam Formation , Dras Arc , Kargil Intrusives , Spongtang Ophiolite Spong Arc , Early Eocene , Indian Zanskar Supergroup , Ras Nindam ,

"The significance of Upper Jurassic felsic volcanic rocks within the in" by Jessica M.J. Walsh, Solomon Buckman et al.


Abstract
The Dras Arc is an island arc terrane located along the Indus Suture within the Ladakh Himalaya. To the north it is juxtaposed against the Eurasian Ladakh Batholith and to the south it is thrust over the Lamayuru Complex and Indian passive margin. Establishing the timing of inception and final collision of the Dras Arc is imperative to reconstructions of the Neotethyan Ocean and timing of arc-continent collisions, prior to the terminal India-Asia continental collision. We describe and date felsic tuffs and adakitic felsic volcanic rock interbedded within the dominantly basaltic-andesitic Dras volcanic complex. These felsic volcanic units yield Upper Jurassic zircon U–Pb ages of 160 ± 3 and 156 ± 1 Ma respectively, making these the oldest reported units within the Dras Arc. We also report zircon U–Pb geochronologic and whole rock geochemical results for the Kargil Intrusive Suite which intrudes the volcanic complex. Previous ages for the intrusives have been repr ....

Jammu And Kashmir , Neotethyan Ocean , Dras Arc , Indus Suture , Eurasian Ladakh Batholith , Lamayuru Complex , Upper Jurassic , Kargil Intrusive Suite , Spongtang Ophiolite Spong Arc , ஜம்மு மற்றும் காஷ்மீர் , மேல் ஜுராசிக் ,