DOI: 10.1016/j.palaeo.2016.01.020
论文题名: A high-resolution geochemical record from the Kuche depression: Constraints on early Miocene uplift of South Tian Shan
作者: Tang Z. ; Yang S. ; Qiao Q. ; Yin F. ; Huang B. ; Ding Z.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 446 起始页码: 1
结束页码: 10
语种: 英语
英文关键词: Cenozoic
; Kuche depression
; Major elements
; Mountain uplift
; Tian Shan
英文摘要: The building of Tian Shan is often simplified to a Cenozoic reactivation of a Paleoz Shan. Moreover, low-temperature thermochronological results revealed that the central Tian Shan merely experienced preoic fold belt. During the past decades extensive case studies have arrived at the conclusion that Tian Shan experienced diachronous uplift during the Cenozoic, however, understanding of the specific location and duration of the mountain building is still hindered by complex tectonic history of the orogenic belt. Considering the geochemical differences of various tectonic units within the mountains, we studied the chemical composition variability for the carbonate-free fine-grained samples collected from the longest terrestrial outcrop in the Kuche depression, southern Tian Shan, at a high resolution in order to better constrain the orogenic process. Our data show significant increases in mobile elements during the interval of 23-17 Ma, departing substantially from the stable long-term weathering trends and limited sedimentary sorting effects. We interpret the trend as provenance changes, which provide crucial evidence to support that the South Tian Shan experienced significant surface uplift during the early Miocene. This argument is supported by other studies conducted on both local and regional scales. Mineralogical analyses for the study section have shown that, since the early Neogene, a marked increase of detrital limeclasts derived from the South Tian Shan is accompanied by the decreases of the abundance of garnets derived from an ultrahigh-pressure metamorphic fold belt in the central Tian-Neogene cooling, contrasting to the southern piedmont of the mountain where Neogene cooling dominated. Taken all together, we conclude that the uplift of the South Tian Shan initiated at ~ 23 Ma and the paleoelevation may exceed the height of the central Tian Shan at ~17 Ma. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68560
Appears in Collections: 过去全球变化的重建
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作者单位: Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, China; Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China; China University of Geoscience, Beijing, China; Key Laboratory of Orogenic Belt of Crustal Evolution Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing, China
Recommended Citation:
Tang Z.,Yang S.,Qiao Q.,et al. A high-resolution geochemical record from the Kuche depression: Constraints on early Miocene uplift of South Tian Shan[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,446