干旱区生态环境知识资源中心(Arid): Growth of the southern Tian Shan-Pamir and its impact on central Asian climate

Arid

DOI	10.1130/B36471.1
	Growth of the southern Tian Shan-Pamir and its impact on central Asian climate
	Richter, Fabiana; Pearson, Jozi; Vilkas, Marius; Heermance, Richard V.; Garzione, Carmala N.; Cecil, M. Robinson; Jepson, Gilby; Moe, Annelisa; Xu, Jianhong; Liu, Langtao; Chen, Jie
通讯作者	Richter, F
来源期刊	GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN	0016-7606
EISSN	1943-2674
出版年	2023
卷号	135 期号:7-8 页码:1859-1878
英文摘要	Uplift and amalgamation of the high elevation (>3000 m) Tian Shan and Pamir ranges in Central Asia restricts westerly atmospheric flow and thereby limits moisture delivery to the leeward Taklimakan Desert in the Tarim Basin (<1500 m), the second largest modern sand dune desert on Earth. Although some research suggests that the hyper-arid conditions observed today in the Tarim Basin developed by ca. 25 Ma, stratigraphic evidence suggests the first erg system did not appear until 12.2 Ma. To address this controversy and to understand the tectonic influences on climate in Central Asia, we studied a continuous, 3800-m-thick stratigraphic section deposited from 15.1 to 0.9 Ma now exposed within the western Kepintagh fold-and-thrust belt in the southern Tian Shan foreland. We present new detrital zircon data (n = 839), new carbonate oxygen (& delta;18Oc) and carbon (& delta;13Cc) stable isotope compositions (n = 368), structural modeling, and stratigraphic observations, and combine these data with recently published magnetostratigraphy and regional studies to reconstruct the history of deposition, deformation, and climate change in the northwestern Tarim Basin. We find that basins along the southern (this study) and northern (i.e., Ili Basin) margins of the Tian Shan were likely receiving similar westerly precipitation by 15 Ma (& delta;18Oc = & SIM;-8%0) and had similar lacustrine-playa environments at ca. 13.5 Ma, despite differences in sedimentary provenance. At ca. 12 Ma, an erg desert formed adjacent to the southern Tian Shan in the northwestern Tarim Basin, coincident with a mid-to late Miocene phase of deformation and exhumation within both the Pamir and southern Tian Shan. Desertification at ca. 12 Ma was marked by a negative & delta;18Oc excursion from -7.8 & PLUSMN; 0.4%0 to -8.7 & PLUSMN; 0.7%0 in the southern Tian Shan foreland (this study), coeval with a negative & delta;18Oc excursion (& SIM;-11 to -13%0) in the Tajik Basin, west of the Pamir. These data suggest that only after ca. 12 Ma did the Pamir-Tian Shan create a high-elevation barrier that effectively blocked westerly moisture, forming a rain shadow in the northwestern Tarim Basin. After 7 Ma, the southern Tian Shan foreland migrated southward as this region experienced widespread deformation. In our study area, rapid shortening and deformation above two frontal foreland faults initiated between 6.0 and 3.5 Ma resulted in positive & delta;13Cc excursions to values close to 0%0, which is interpreted to reflect exhumation in the Tian Shan and recycling of Paleozoic carbonates. Shortening led to isolation of the study site as a piggy-back basin by 3.5 Ma, when the sediment provenance was limited to the exhumed Paleozoic basement rocks of the Kepintagh fold belt. The abrupt sedimentologic and isotopic changes observed in the southern Tian Shan foreland appear to be decoupled from late Cenozoic global climate change and can be explained entirely by local tectonics. This study highlights how tectonics may overprint the more regional and global climate signals in active tectonic settings.
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:001035018000004
WOS关键词	CENOZOIC TECTONIC EVOLUTION ; NW CHINA IMPLICATIONS ; U-TH-PB ; TARIM BASIN ; TIEN-SHAN ; THRUST BELT ; ISOTOPIC CONSTRAINTS ; EXHUMATION HISTORY ; NORTHERN MARGIN ; FORELAND BASIN
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/396717
推荐引用方式 GB/T 7714	Richter, Fabiana,Pearson, Jozi,Vilkas, Marius,et al. Growth of the southern Tian Shan-Pamir and its impact on central Asian climate[J],2023,135(7-8):1859-1878.
APA	Richter, Fabiana.,Pearson, Jozi.,Vilkas, Marius.,Heermance, Richard V..,Garzione, Carmala N..,...&Chen, Jie.(2023).Growth of the southern Tian Shan-Pamir and its impact on central Asian climate.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,135(7-8),1859-1878.
MLA	Richter, Fabiana,et al."Growth of the southern Tian Shan-Pamir and its impact on central Asian climate".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 135.7-8(2023):1859-1878.