کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6444386 | 1640371 | 2015 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Late-Miocene palaeoecological evolution of the Tianshui Basin, NE Tibetan Plateau: Evidence from stable organic carbon isotope record
ترجمه فارسی عنوان
تکامل پالایئوکولوژیکی پسین-مایوسن حوضه تیانشویی، فلات تی ای نیویورک: شواهد حاصل از ضبط ایزوتوپ کربن آلی کربن
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کلمات کلیدی
ایزوتوپ کربن پایدار، پالایئوکولوژی، حوضه تیانشویی، تبت پلاتو، دیرینه میوزن،
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
زمین شناسی
چکیده انگلیسی
The spatial and temporal variations and the driving mechanisms of C3/C4 vegetation evolution throughout the Miocene have been a matter of long-standing debate. A continuous lacustrine-fluvial sediment sequence widely exposed in the Tianshui Basin, NE Tibetan Plateau provides great potential for deciphering the C3/C4 vegetation dynamics during the Miocene. Based on the measurements of δ13Corg, C, N, and C/N ratios of organic matter of this sediment sequence, here we present a new perspective on vegetation history in inland Asia during the period from 17.1 to 6.1 Ma. The organic matter preserved in the Tianshui Basin is most likely a mixture of terrestrial and aquatic origins. The lack of correlation between organic δ13Corg and carbonate δ13Ccarb indicates that terrestrial plants made a dominant contribution to the organic matter. The δ13Corg of organic matter shows negative values (between â24.1â° and â28.3â°) along the sequence from 17.1 to 6.1 Ma, indicating a predominance of C3 plants. More specifically, our results indicate that the δ13Corg values of organic matter show a significant increase by ca. 1.4â° from â26.6â° to â25.2â° from 7.1 Ma onwards (equivalent to ca. 10% increase in C4 plants), reflecting the initial occurrence of C4 plants. The occurrence and expansion of the C4 component in the study area is supposed to be a result of increasing summer precipitation due to the enhanced Asian Summer Monsoon since that time.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Asian Earth Sciences - Volume 98, February 2015, Pages 296-303
Journal: Journal of Asian Earth Sciences - Volume 98, February 2015, Pages 296-303
نویسندگان
Zhanfang Hou, Jijun Li, Chunhui Song, Jingjing Meng, Jun Zhang,