A high-resolution geochemical record from the Kuche depression: Constraints on early Miocene uplift of South Tian Shan
A high-resolution geochemical record from the Kuche depression: Constraints on early Miocene uplift of South Tian Shan
复制标题
库车坳陷高分辨率地球化学记录：对南天山早中新世隆升的制约
DOI：
10.1016/j.palaeo.2016.01.020
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发表时间：
2016-03
期刊：
影响因子：
--
通讯作者：
Ding Zhongli
中科院分区：
文献类型：
--
作者：
Tang Zihua;Yang Shiling;Qiao Qingqing;Yin Feng;Huang Baochun;Ding Zhongli
天山的形成常被简化为古生代褶皱带在新生代的复活。在过去的几十年中，广泛的案例研究得出的结论是，天山经历了穿时隆升在新生代，然而，了解造山运动的具体位置和持续时间仍然受到阻碍复杂的构造历史的造山带。考虑到山内不同构造单元的地球化学差异，为了更好地反映造山作用，对采自库车坳陷南部最长陆地露头的无碳酸盐细粒样品进行了高分辨率的化学成分变化研究。我们的数据显示，在23-17 Ma的时间间隔期间，移动的元素显着增加，大大偏离了稳定的长期风化趋势和有限的沉积分选效果。我们将这种趋势解释为物源变化，这为南天山在中新世早期经历了显著的地表抬升提供了重要证据。这一论点得到了在地方和区域范围内进行的其他研究的支持。对研究剖面的矿物学分析表明，自新近纪早期以来，南天山碎屑灰岩的数量显著增加，而中天山超高压变质褶皱带石榴石的丰度则减少。此外，低温热年代学结果表明，天山中部仅经历了前新近纪冷却，而南部皮埃蒙特的新近纪冷却占主导地位。综合分析认为，南天山的隆升开始于23 Ma左右，古高程可能在17 Ma左右超过中天山。
The building of Tian Shan is often simplified to a Cenozoic reactivation of a Paleozoic fold belt. During the past decades extensive case studies have arrived at the conclusion that Tian Shan experienced diachronous uplift during the Cenozoic, however, understanding of the specific location and duration of the mountain building is still hindered by complex tectonic history of the orogenic belt. Considering the geochemical differences of various tectonic units within the mountains, we studied the chemical composition variability for the carbonate-free fine-grained samples collected from the longest terrestrial outcrop in the Kuche depression, southern Tian Shan, at a high resolution in order to better constrain the orogenic process. Our data show significant increases in mobile elements during the interval of 23–17 Ma, departing substantially from the stable long-term weathering trends and limited sedimentary sorting effects. We interpret the trend as provenance changes, which provide crucial evidence to support that the South Tian Shan experienced significant surface uplift during the early Miocene. This argument is supported by other studies conducted on both local and regional scales. Mineralogical analyses for the study section have shown that, since the early Neogene, a marked increase of detrital limeclasts derived from the South Tian Shan is accompanied by the decreases of the abundance of garnets derived from an ultrahigh-pressure metamorphic fold belt in the central Tian Shan. Moreover, low-temperature thermochronological results revealed that the central Tian Shan merely experienced pre-Neogene cooling, contrasting to the southern piedmont of the mountain where Neogene cooling dominated. Taken all together, we conclude that the uplift of the South Tian Shan initiated at ~ 23 Ma and the paleoelevation may exceed the height of the central Tian Shan at ~ 17 Ma.
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影响因子：
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作者：
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通讯作者：
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