Asset Details
Do you wish to reserve the book?
Chronology, geochemical characteristics, and tectonic implications of a Triassic complex in the Rongma Area, Southern Qiangtang, Tibet
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
Chronology, geochemical characteristics, and tectonic implications of a Triassic complex in the Rongma Area, Southern Qiangtang, Tibet
Do you wish to request the book?
Chronology, geochemical characteristics, and tectonic implications of a Triassic complex in the Rongma Area, Southern Qiangtang, Tibet
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
Chronology, geochemical characteristics, and tectonic implications of a Triassic complex in the Rongma Area, Southern Qiangtang, Tibet
2022
Overview
The spatio-temporal evolution of the Paleo-Tethys Ocean has been a hot and controversial issue in the world. Here we carry out petrographic, chronological, and geochemical study on garnet–phengite–quartz schist and mafic rocks in the Rongma area from the northern margin of the Southern Qiangtang block to determine the early Mesozoic tectonic evolution of the Shuanghu Paleo-Tethys Ocean in northern Tibet. The zircons from a phengite–quartz schist sample yielded concordant ages of 1936–393 Ma, indicating that its protolith deposited after ~ 393 Ma. Overgrowth zoning garnet with three stages of metamorphic evolution from garnet core to rim (i.e., Peak metamorphic, early retrograde metamorphic, and late retrograde metamorphic stages) in the schist was recognized, indicating that two subduction in a short time might be involved for its genesis. Two groups of phengite in the schist yielded 40Ar/39Ar plateau ages of 229 ± 1.4 Ma and 225 ± 1.3 Ma, respectively; thus, the late retrograde metamorphism of the schist might occur at ~ 229–225 Ma. Zircon U–Pb dating of a diabase in the area yielded crystallization age of 241 ± 1.1 Ma implying its formation in the early Triassic. The Hf-in-zircon and whole-rock Nd isotopes of the diabase show εHf(t) of − 0.6- + 19.1 and εNd(t) of − 0.8 to + 0.9, respectively. Combined with the whole-rock geochemical features of the early Triassic diabase (241 Ma) and gabbro (237 Ma), they indicate that these mafic rocks are formed in a back-arc extensional setting related to the subduction of the oceanic plate between the Northern and Southern Qiangtang blocks beneath the latter. Combined with regional data, our study favors that view bi-directional subduction of the Shuanghu Paleo-Tethys ocean in the Early Triassic and it was finally closed at ~ 237 to ~ 229 Ma. Our model will help us better understand the tectonic evolution of the Paleo-Tethys Ocean.
