New evidence from stable isotope for the uplift of mountains in northern edge of the Qinghai-Tibetan Plateau

Abstract. There is considerable controversy regarding the age ranges of Tibetan ice cores. The Guliya ice core was reported to reach as far back as ∼760 ka (kiloannum, i.e. 1000 years), whereas chronologies of all other Tibetan cores cover at most the Holocene. Here we present ages for two new ice cores reaching bedrock, from the Zangser Kangri (ZK) glacier in the northwestern Tibetan Plateau and the Shulenanshan (SLNS) glacier in the western Qilian Mountains. We estimated bottom ages of 8.90±0.570.56 ka and 7.46±1.461.79 ka for the ZK and SLNS ice core respectively, further constraining the time range accessible by Tibetan ice cores to the Holocene.

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Climatic variation in the Linxia basin, NE Tibetan Plateau, from 13.1 to 4.3 Ma: The stable isotope record

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2006.11.001 ◽

2007 ◽

Vol 247 (3-4) ◽

pp. 313-328 ◽

Cited By ~ 46

Author(s):

Majie Fan ◽

David L. Dettman ◽

Chunhui Song ◽

Xiaomin Fang ◽

Carmala N. Garzione

Keyword(s):

Stable Isotope ◽

Tibetan Plateau ◽

Climatic Variation ◽

Linxia Basin ◽

Isotope Record ◽

Stable Isotope Record ◽

Ne Tibetan Plateau

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Hydrothermal dolomitization in the Lower Silurian Sayabec Formation in northern Gaspé – Matapédia (Québec): constraint on timing of porosity and regional significance for hydrocarbon reservoirs

Bulletin of Canadian Petroleum Geology ◽

10.2113/52.3.256 ◽

2004 ◽

Vol 52 (3) ◽

pp. 256-269 ◽

Cited By ~ 20

Author(s):

Denis Lavoie ◽

Claude Morin

Keyword(s):

High Temperature ◽

Stable Isotope ◽

Isotope Ratios ◽

Stable Isotope Ratios ◽

Lower Silurian ◽

The Matrix ◽

Saddle Dolomite ◽

Northern Edge ◽

Calcite Cement ◽

Hydrocarbon Charge

Abstract The study of dolostone of the Lower Silurian Sayabec Formation of the Lac Matapédia syncline, at the western end of the Gaspé Peninsula, sheds new light on porosity development and reservoir potential of the area. The dolomitized section is close to the Shickshock Sud Fault that cuts the southern limb of the syncline. The dolostone occurs either as a highly brecciated unit or as stratiform replacement of peritidal carbonates at the base of the formation. Residual bitumen is seen in the breccia as well as filling of small secondary vugs and fractures within the stratiform dolostone. The dolostone consists predominantly of replacive matrix dolomite; petrography and oxygen and carbon stable isotope ratios (δ18OVPDB = −6.3 to −7.8‰ and δ13CVPDB = 1.2 to 3.3‰) of the matrix dolomite indicate early burial formation with later recrystallization in the presence of high temperature fluids. Saddle dolomite is found as a pore-filling cement in secondary dissolution pores and fractures. Oxygen stable isotope ratios of the saddle dolomite cement (δ18OVPDB = −14.5 and −15.3‰) indicate precipitation at high temperature. Dull luminescent burial calcite cement follows saddle dolomite. Later dissolution is locally apparent in carbonates as scalloped surfaces covered by finely laminated, bright-very dull luminescent calcites. Petrography and stable isotope ratios of the calcite (δ18OVPDB = −10.1 and −11.2‰ and δ13CVPDB = −2.3 and −6.9‰) suggest precipitation from meteoric waters. Meteoric dissolution and luminescent-zoned calcite cements are related to a Pridolian sea level lowstand. This event provides a first age constraint on the timing of the hydrothermal dolomitization and hydrocarbon charge of the Sayabec Formation along the northern edge of the Gaspé Belt. The Shickshock Sud Fault channelled the hydrothermal fluids, which dolomitized the Sayabec Formation shortly after initial burial. A recent regional seismic program showed compressive structures (duplexes, backthrust, triangle zone) in the Sayabec Formation inferred to have occurred in latest Silurian–Early Devonian that generated structural traps superimposed on the stratigraphic (shaly facies) and diagenetic (tight non-dolomitized limestone) seals. Seismic anomalies (“flat spots”) in the Lower Silurian section in eastern Quebec suggest the presence of hydrocarbon-filled reservoirs.

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High Contribution of South Asian Biomass Burning to Southeastern Tibetan Plateau Air: New Evidence from Radiocarbon Measurement

Environmental Science & Technology Letters ◽

10.1021/acs.estlett.1c00860 ◽

2021 ◽

Author(s):

Junwen Liu ◽

Ming Chang ◽

Zhineng Cheng ◽

Sanyuan Zhu ◽

Ping Ding ◽

...

Keyword(s):

Tibetan Plateau ◽

South Asian ◽

Biomass Burning ◽

Southeastern Tibetan Plateau ◽

High Contribution ◽

New Evidence

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Seasonal variations of stable isotope in precipitation and moisture transport at Yushu, eastern Tibetan Plateau

Science in China Series D Earth Sciences ◽

10.1007/s11430-008-0089-1 ◽

2008 ◽

Vol 51 (8) ◽

pp. 1121-1128 ◽

Cited By ~ 30

Author(s):

LiDe Tian ◽

LingLong Ma ◽

WuSheng Yu ◽

ZhongFang Liu ◽

ChangLiang Yin ◽

...

Keyword(s):

Stable Isotope ◽

Tibetan Plateau ◽

Seasonal Variations ◽

Moisture Transport ◽

Eastern Tibetan Plateau

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Characteristics and sources of dissolved organic matter in a glacier in the northern Tibetan Plateau: differences between different snow categories

Annals of Glaciology ◽

10.1017/aog.2018.20 ◽

2018 ◽

Vol 59 (77) ◽

pp. 31-40 ◽

Cited By ~ 2

Author(s):

Lin Feng ◽

Yanqing An ◽

Jianzhong Xu ◽

Shichang Kang

Keyword(s):

Organic Matter ◽

Tibetan Plateau ◽

Dissolved Organic Matter ◽

Melting Rate ◽

Ion Cyclotron Resonance ◽

The Tibetan Plateau ◽

Mountain Glaciers ◽

Northern Tibetan Plateau ◽

Fresh Snow ◽

Northern Edge

AbstractDissolved organic matter (DOM) in mountain glaciers is an important source of carbon for downstream aquatic systems, and its impact is expected to increase due to the increased melting rate of glaciers. We present a comprehensive study of Laohugou glacier no. 12 (LHG) at the northern edge of the Tibetan Plateau to characterize the DOM composition and sources by analyzing surface fresh snow, granular ice samples, and snow pit samples which covered a whole year cycle of 2014/15. Excitation–emission matrix fluorescence spectroscopy analysis of the DOM with parallel factor analysis (EEM-PARAFAC) identified four components, including a microbially humic-like component (C1), two protein-like components (C2 and C3) and a terrestrial humic-like component (C4). The use of Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) showed that DOM from all these samples was dominated by CHO and CHON molecular formulas, mainly corresponding to lipids and aliphatic/proteins compounds, reflecting the presence of significant amounts of microbially derived and/or deposited biogenic DOM. The molecular compositions of DOM showed more CHON compounds in granular ice than in fresh snow, likely suggesting newly formed DOM from microbes during snowmelting.

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