Intensified tectonic deformation and uplift of the Altyn Tagh range recorded by rock magnetism and growth strata studies of the western Qaidam Basin, NE Tibetan Plateau
Intensified tectonic deformation and uplift of the Altyn Tagh range recorded by rock magnetism and growth strata studies of the western Qaidam Basin, NE Tibetan Plateau
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DOI：
10.1016/j.gloplacha.2015.12.017
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发表时间：
2016-02
影响因子：
3.9
通讯作者：
Tao Zhang;W. Han;X. Fang;Weilin Zhang;Chunhui Song;M. Yan
中科院分区：
文献类型：
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作者：
Tao Zhang;W. Han;X. Fang;Weilin Zhang;Chunhui Song;M. Yan
阿尔金山脉作为青藏高原的构造和地理北方边缘，其演化史一直备受关注。对青藏高原隆升及其对气候变化的影响进行精确的测年研究，对于了解青藏高原隆升的可能机制及其对气候变化的影响至关重要。在盆山耦合框架下，对红沟子剖面晚新生代沉积物进行了磁化率和岩石磁学研究。17-5 HGZ剖面的磁化率记录显示出两个阶段的变化，在120-596 m（约1.0Ma）的地层中，磁化率值保持相对较低的稳定值。17-10 Ma）（阶段I），但在596 - 1014 m（约. 10-5 Ma）（阶段II）。岩石磁学结果表明，第一阶段以顺磁性矿物或粘土矿物、磁赤铁矿和赤铁矿为主，第二阶段被磁铁矿和磁赤铁矿所取代。将HGZ剖面的磁化率记录与区域构造和气候记录进行了详细的对比。结合层序内沉积相、岩性、角度不整合，以及地震地层学、古水流和物源分析，探讨了磁化率变化的可能机制。结果表明，磁化率变化与阿尔金山脉的隆升有直接联系。十马。
As the tectonical and geographical northern edge of the Tibetan Plateau, the evolution of the Altyn Tagh range has attracted wide attention. Precise dating of its activities is believed essential for understanding the possible mechanisms of the Tibetan Plateau uplift and its effects on climate changes. Under the framework of basin–mountain coupling, both magnetic susceptibility and rock magnetic researches were carried out in this study on the Late Cenozoic sediments of the Honggouzi (HGZ) section (ca. 17–5 Ma) in the western Qaidam Basin to explore the tectonic and climatic evolution as well as their interactions of the Altyn Tagh range.The obtained magnetic susceptibility record in the HGZ section displayed a two-step variation, which kept relatively low and stable values for sediments from the stratigraphic levels of 120–596 m (ca. 17–10 Ma) (stage I), but increased rapidly from 596 to 1014 m (ca. 10–5 Ma) (stage II). The rock magnetic results revealed that paramagnetic minerals or clay minerals, maghemite and hematite are dominant in stage I, which were replaced by magnetite and maghemite in stage II. A detailed comparison of magnetic susceptibility record in the HGZ section with regional tectonic and climate records was carried out. Combined with sedimentary facies, lithology and angular unconformity in the sequence, as well as seismostratigraphy data, paleocurrent and provenance analyses, the possible mechanisms for the magnetic susceptibility variation were explored. The results indicated a direct link between magnetic susceptibility change and the uplift of the Altyn Tagh range at ca. 10 Ma.