Structural evolution of the Yushu-Nanqian region and its relationship to syncollisional igneous activity, east-central Tibet Export

@article{SpurlinGSA05, abstract = {Field mapping, geochronological analyses, and cross section construction reveal a protracted deformation history and a minimum of 61 km of Cenozoic NE-SW shortening (in present coordinates) across the Yushu-Nangqian thrust belt in northern Tibet. Cenozoic contraction started prior to 51 Ma and was followed fi rst by northwest-striking right-slip faulting and later by northwest-striking left-slip faulting. Renewed NE-SW contraction is expressed by folding of Neogene strata and thrusting, which again was followed by northweststriking left-slip faults. Late Neogene deformation is expressed by local north-striking normal faults. Shortening across the Yushu- Nangqian belt appears to be accommodated by thin-skinned thrusting, which raises the question of how the deformation was accommodated in the lower crustal levels. To resolve this problem, we perform geochemical analysis of igneous rocks dated as 51–49 and 38–37 Ma. The rocks exhibit geochemical signatures characteristic of subduction, which implies that coeval crustal thickening in northeastern Tibet was most likely induced by continental subduction.}, author = {Spurlin, Matthew and Yin, An and Horton, Brian and Zhou, Jiangyu and Wang, Jianghai}, citeulike-article-id = {695057}, journal = {Geological Society of America Bulletin}, keywords = {basin, basin\_evolution, shortening, tertiary, thickening, tibet}, number = {9-10}, pages = {1293--1317}, posted-at = {2006-06-13 18:24:48}, priority = {5}, title = {Structural evolution of the Yushu-Nanqian region and its relationship to syncollisional igneous activity, east-central Tibet}, volume = {117}, year = {2005} }

TY - JOUR ID - SpurlinGSA05 L3 - citeulike-article-id:695057 N2 - Field mapping, geochronological analyses, and cross section construction reveal a protracted deformation history and a minimum of 61 km of Cenozoic NE-SW shortening (in present coordinates) across the Yushu-Nangqian thrust belt in northern Tibet. Cenozoic contraction started prior to 51 Ma and was followed fi rst by northwest-striking right-slip faulting and later by northwest-striking left-slip faulting. Renewed NE-SW contraction is expressed by folding of Neogene strata and thrusting, which again was followed by northweststriking left-slip faults. Late Neogene deformation is expressed by local north-striking normal faults. Shortening across the Yushu- Nangqian belt appears to be accommodated by thin-skinned thrusting, which raises the question of how the deformation was accommodated in the lower crustal levels. To resolve this problem, we perform geochemical analysis of igneous rocks dated as 51–49 and 38–37 Ma. The rocks exhibit geochemical signatures characteristic of subduction, which implies that coeval crustal thickening in northeastern Tibet was most likely induced by continental subduction. IS - 9-10 JF - Geological Society of America Bulletin EP - 1317 TI - Structural evolution of the Yushu-Nanqian region and its relationship to syncollisional igneous activity, east-central Tibet VL - 117 SP - 1293 KW - basin KW - basin_evolution KW - shortening KW - tertiary KW - thickening KW - tibet AU - Spurlin, Matthew AU - Yin, An AU - Horton, Brian AU - Zhou, Jiangyu AU - Wang, Jianghai PY - 2005/// ER -