气候变化领域集成服务门户(CCPortal): Erosion in northwest Tibet from in-situ-produced cosmogenic Be-10 and Al-26 in bedrock

CCPortal

DOI	10.1002/esp.1380
	Erosion in northwest Tibet from in-situ-produced cosmogenic Be-10 and Al-26 in bedrock
	Kong, Ping; Na, Chunguang; Fink, David; Ding, Lin; Huang, Feixin
发表日期	2007
ISSN	0197-9337
EISSN	1096-9837
起始页码	116
结束页码	125
卷号	32 期号:1
英文摘要	Concentrations of in-situ-produced cosmogenic nuclides Be-10 and Al-26 in quartz were measured by accelerator mass spectrometry for bedrock basalts and sandstones located in northwest Tibet. The effective exposure ages range between 23 and 134 ka (Be-10) and erosion rates between 4.0 and 24 mm ka(-1). The erosion rates are significantly higher than those in similarly and Antarctica and Australia, ranging between 0.1 and 1 mm ka(-1), suggesting that precipitation is not the major control of erosion of landforms. Comparison of erosion rates in and regions with contrasting tectonic activities suggests that tectonic activity plays a more important role in controlling long-term erosion rates. The obtained erosion rates are, however, significantly lower than the denudation rate of 3000-6000 mm ka(-1) beginning at c. 53 Ma in the nearby Godwin Austen (K2) determined by apatite fission-track thermochronology. It appears that the difference in erosion rates within different time intervals is indicative of increased tectonic activity at c. 5-3 Ma in northwest Tibet. We explain the low erosion rates determined in this study as reflecting reduced tectonic activity in the last million years. A model of localized thinning of the mantle beneath northwest Tibet may account for the sudden increased tectonic activity at c. 5-3 Ma and the later decrease. Copyright (c) 2006 John Wiley & Sons, Ltd.
关键词	PRODUCTION-RATES GLOBAL CLIMATE SEDIMENT PRODUCTION ICE-SHEET UPLIFT EVOLUTION PLATEAU AUSTRALIA VOLCANISM ISOTOPES
英文关键词	erosion rate; cosmogenic nuclide; northwest Tibet; uplift; tectonics
语种	英语
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000243696000009
来源期刊	EARTH SURFACE PROCESSES AND LANDFORMS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257481
推荐引用方式 GB/T 7714	Kong, Ping,Na, Chunguang,Fink, David,et al. Erosion in northwest Tibet from in-situ-produced cosmogenic Be-10 and Al-26 in bedrock[J]. 中国科学院青藏高原研究所,2007,32(1).
APA	Kong, Ping,Na, Chunguang,Fink, David,Ding, Lin,&Huang, Feixin.(2007).Erosion in northwest Tibet from in-situ-produced cosmogenic Be-10 and Al-26 in bedrock.EARTH SURFACE PROCESSES AND LANDFORMS,32(1).
MLA	Kong, Ping,et al."Erosion in northwest Tibet from in-situ-produced cosmogenic Be-10 and Al-26 in bedrock".EARTH SURFACE PROCESSES AND LANDFORMS 32.1(2007).