Science China Earth Sciences
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Plate boundary processes of the Caroline Plate
Science China Earth Sciences - Tập 65 - Trang 1554-1567 - 2022
The tectonic evolution of the Caroline Plate during the Oligocene to Early Miocene was mainly controlled by two fulcrums. The west fulcrum at Palau Island remained fixed during 29–25 Ma as the Ayu Trough rifted and produced the abyssal hills parallel to its boundaries, and the Pacific Plate and part of the Caroline Plate subducted to the north. At the northeast corner of the Caroline Plate, the ea...... hiện toàn bộ
Analysis of reconstructed annual precipitation from tree-rings for the past 500 years in the middle Qilian Mountain
Science China Earth Sciences - Tập 55 - Trang 770-778 - 2012
The ring-width chronology of a Juniperus przewalskii tree from the middle of the Qilian Mountain was constructed to estimate the annual precipitation (from previous August to current July) since AD 1480. The reconstruction showed four major alternations of drying and wetting over the past 521 years. The rainy 16th century was followed by persistent drought in the 17th century. Moreover, relatively...... hiện toàn bộ
The distribution characteristic and its significance of compound specific isotopic composition of aromatic hydrocarbon from marine source rock and oil in the Tarim Basin, western China
Science China Earth Sciences - Tập 57 - Trang 2791-2798 - 2014
Aromatic hydrocarbons are generally main distillation of crude oil and organic extract of source rocks. Bicyclic and tricyclic aromatic hydrocarbons can be purified by two-step method of chromatography on alumina. Carbon isotopic composition of individual aromatic hydrocarbons is affected not only by thermal maturity, but also by organic matter input, depositional environment, and hydrocarbon gene...... hiện toàn bộ
A comparative analysis of five global cropland datasets in China
Science China Earth Sciences - - 2016
Accurate information of cropland area and spatial location is critical for studies of national food security, global environmental change, terrestrial ecosystem geophysics and the geochemical cycle. In this paper, we compared five global cropland datasets in circa 2010 of China from in terms of cropland area and spatial location, including GlobalLand30, FROM-GLC, GlobCover, MODIS Collection 5, and...... hiện toàn bộ
Solar forcing of desert vegetation and drought frequency during the last 2700 years in the interior Qaidam Basin, northeastern Tibetan Plateau
Science China Earth Sciences - Tập 63 - Trang 561-574 - 2020
Knowledge of long-term change in vegetation and climate in semi-arid/arid regions is essential for the study of current climate and development of mitigation strategies against severe drought. Here, a fossil pollen record of annually-varved core from Sugan Lake in interior Qaidam Basin was quantitatively analyzed to reconstruct changes in vegetation, floristic diversity and drought frequency. Resu...... hiện toàn bộ
A continuous simulation of Holocene effective moisture change represented by variability of virtual lake level in East and Central Asia
Science China Earth Sciences - Tập 63 - Trang 1161-1175 - 2020
The fluctuation of a single lake level is a comprehensive reflection of water balance within the basin, while the regional consistent fluctuations of lake level can indicate the change of regional effective moisture. Previous researches were mainly focused on reconstructing effective moisture by multiproxy analyses of lake sediments. We carried out a series of experiments, including a transient cl...... hiện toàn bộ
Chỉ số tinh thể thạch anh: Bằng chứng định lượng mới về silica sinh học của đá bùn chứa hữu cơ từ cuối Ordovician đến đầu Silurian ở lưu vực Tứ Xuyên và các khu vực lân cận, Trung Quốc Dịch bởi AI
Science China Earth Sciences - Tập 64 - Trang 773-787 - 2021
Chỉ số tinh thể thạch anh (QCI) được sử dụng để phản ánh quá trình tinh thể hóa silica trong đá phiến Wufeng (WF) từ cuối Ordovician và đá phiến Longmaxi (LM) từ đầu Silurian, cũng như silica có nguồn gốc từ tro núi lửa trong đá phiến tuffaceous của Formation Lucaogou, nhằm phân biệt hai loại silica này. Silica trong các sinh quyển graptolite khác nhau cho thấy sự tinh thể hóa khác nhau. Các sinh ...... hiện toàn bộ
Geology and mineralization of the Songpan-Ganze-West Kunlun pegmatite-type rare-metal metallogenic belt in China: An overview and synthesis
Science China Earth Sciences - Tập 66 - Trang 1702-1724 - 2023
The Songpan-Ganze orogenic belt on the northeastern margin of the Tibetan Plateau extends westward from the Songpan-Ganze terrain in western Sichuan to the Tianshuihai region in West Kunlun, Xinjiang. It hosts numerous giant spodumene pegmatite deposits and ore fields, including Jiajika and Ke’eryin in western Sichuan Province, Zhawulong on the border between the Sichuan and Qinghai Provinces, and...... hiện toàn bộ
The large increase of δ 13Ccarb-depth gradient and the end-Permian mass extinction
Science China Earth Sciences - Tập 55 - Trang 1101-1109 - 2012
Carbonate carbon isotope (δ
13Ccarb) has received considerable attention in the Permian-Triassic transition for its rapid negative shift coinciding with the great end-Permian mass extinction event. The mechanism has long been debated for such a δ
13Ccarb negative excursion through the end-Permian crisis and subsequent large perturbations in the entire Early Triassic...... hiện toàn bộ
Focal mechanisms of the Lushan earthquake sequence and spatial variation of the stress field
Science China Earth Sciences - - 2015
Using broadband seismic records from regional networks, we determined the focal mechanisms and depths of 37 earthquakes in the 2013 M7.0 Lushan earthquake sequence (3.4⩽M
w⩽5.1) by fitting the three-component waveform data. The results show that the earthquakes are predominantly thrust events, with occasional strike-slip mechanisms. Most earthquakes occurred at depths of 10–20 km. ...... hiện toàn bộ
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