Timing of eclogite facies metamorphism in the North Qinling by U–Pb and Lu–Hf geochronology

Silurian high-pressure granulites from Central Qiangtang, Tibet: Constraints on early Paleozoic collision along the northeastern margin of Gondwana

“…Considering the paleogeographic framework of eastern Gondwana, early Paleozoic metamorphic rocks, especially the ultrahigh/high- Chen et al, 2007Chen et al, , 2009Zhang et al, 2008;Song et al, 2006;Yu et al, 2013), the South Altyn (501-485 Ma; Zhang et al, 2005;Liu et al, 2012;Cao et al, 2013), the North Qinling orogen (ca. 511-480 Ma, Liu et al, 2010;Zhang et al, 2011;Wang et al, 2011;Cheng et al, 2011Cheng et al, , 2012ca. 440-424 Ma, Zhang et al, 2011), Sibumasu (ca.…”

“…501-485 Ma; Zhang et al, 2005;Liu et al, 2012;Cao et al, 2013), the North Qinling orogen (ca. 511-480 Ma; Liu et al, 2010;Zhang et al, 2011;Cheng et al, 2011Cheng et al, , 2012Wang et al, 2011;ca. 440-424 Ma, Zhang et al, 2011), Sibumasu (ca.…”

Granitic magmatism related to early Paleozoic continental collision in North Qinling

“…The HP-UHP metamorphism with the peak age of 500 Ma and two-phase retrogressive metamorphism of 450 Ma granulite-and 420 Ma amphibolitefacies, were distinguished in the NQB. The HP-UHP rocks are interpreted as the products of deep continental subduction, whereas two separate uplift events might be responsible for the two-phase retrogressive metamorphism [14][15][16]. Obviously, the three stages of granitic magmatism with the ages of 500, 450 and 420 Ma (Figure 2) are consistent with the HP-UHP peak metamorphism and the two-phase retrogressive metamorphism, and their occurrences might be attributed to closure of Qinling ocean basin, the collision between NCB and SQB, and the related thermotectonic magma events.…”

“…However, the early tectonic evolution of the Qinling orogen is poorly constrained, such as the timing of subduction of Paleozoic oceanic crust and subsequent collisional process for the closure of Paleotethys. Advances have been made in the understanding of time-space distribution and the nature of HP-UHP metamorphism in the NQB [4][5][6][7][8][9][10][11][12][13][14][15] after two-decade consistent studies, demonstrating that the early Paleozoic HP-UHP metamorphism was the consequence of northward continental deep-subduction along the SDSZ [16]. The new results concerning the early Paleozoic HP-UHP metamorphism shed some new light on the process and age of subduction of the oceanic crust as well as amalgamation among continental blocks during the early Paleozoic in the Qinling orogen.…”

Review on the Triassic Post-collisional Magmatism in the Qinling Collision Belt

“…그리고 북친링 소대륙판은 다시 북중국판과 430 Ma 경에 충돌이 완료되었고 400 Ma 경에는 남 친링 소대륙판이 북중국판의 일부가 된 북친링 소대 륙판과 충돌하였으며 이들 충돌 과정에서 샹단 전단 대를 형성되었다 (Dong et al, 2011). 하지만 북친링 소대륙판내에 나타나는 초고압 에클로자이트로가 형 성된 연령인 490-507 Ma (Wang et al, 2011;Cheng et al, 2012;Liu et al, 2013) (Sun et al, 2002;Chen et al, 2003;Yang et al, 2005Yang et al, , 2006. 그리고 충돌대의 동측인 한반도와 충돌대의 서 측인 친링지역에는 광역적인 트라이아스기 충돌 후 화성암이 관입을 하였다 Dong et al, 2011;Kim et al, 2011 Granite ( Pearce et al, 1984;Pearce, 1996), field are defined as follows: syn-COLG(syn-collisional granites), Post-COLG(post-collisional granites), WPG(within plate granite), ORG(ocean-ridge granite), VAG(volcanic-arc granite) and (b) the Rb-Hf-Ta discrimination diagrams (after Harris et al, 1986 Fig.…”