The vegetation and climate change during Neocene and Early Quaternary in Jiuxi Basin, China

Ma, Yongjing; Fang, Xiaomin; Li, Jijun; Wu, Fuli; Zhang, Jun

doi:10.1360/03yd0110

Cited by 73 publications

(37 citation statements)

References 13 publications

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“…7b). This finding contradicts Ma et al (1998Ma et al ( , 2005 and Sun et al (2009), who claim humid conditions in NW-China in the Tortonian and the initiation of the desert around 8-7 Ma. It is, however, in agreement with the δ 18 O records from Linxia Basin (Dettman et al, 2003) and the high hypsodonty ( Fig.…”

Section: Aridity In C-asiacontrasting

confidence: 60%

Regional climate model experiments to investigate the Asian monsoon in the Late Miocene

2011

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Abstract. The Late Miocene (11.6-5.3 Ma) is a crucial period in the history of the Asian monsoon. Significant changes in the Asian climate regime have been documented for this period, which saw the formation of the modern Asian monsoon system. However, the spatiotemporal structure of these changes is still ambiguous, and the associated mechanisms are debated. Here, we present a simulation of the average state of the Asian monsoon climate for the Tortonian (11-7 Ma) using the regional climate model CCLM3.2. We employ relatively high spatial resolution (1 • × 1 • ) and adapt the physical boundary conditions such as topography, land-sea distribution and vegetation in the regional model to represent the Late Miocene. As climatological forcing, the output of a Tortonian run with a fully-coupled atmosphere-ocean general circulation model is used. Our regional Tortonian run shows a stronger-than-present East Asian winter monsoon wind as a result of the enhanced mid-latitude westerly wind of our global forcing and the lowered present-day northern Tibetan Plateau in the regional model. The summer monsoon circulation is generally weakened in our regional Tortonian run compared to today. However, the changes of summer monsoon precipitation exhibit major regional differences. Precipitation decreases in northern China and northern India, but increases in southern China, the western coast and the southern tip of India. This can be attributed to the changes in both the regional topography (e.g. the lower northern Tibetan Plateau) and the global climate conditions (e.g. the higher sea surface temperature). The spread of dry summer conditions over northern China and northern Pakistan in our Tortonian run further implies that the monsoonal climate may not have been Correspondence to: H. Tang (hui.tang@helsinki.fi) fully established in these regions in the Tortonian. Compared with the global model, the high resolution regional model highlights the spatial differences of the Asian monsoon climate in the Tortonian, and better characterizes the convective activity and its response to regional topographical changes. It therefore provides a useful and compared to global models, a complementary tool to improve our understanding of the Asian monsoon evolution in the Late Miocene.

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Section: Aridity In C-asiacontrasting

confidence: 60%

Regional climate model experiments to investigate the Asian monsoon in the Late Miocene

2011

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“…Pollen data show that the modern-like Chenopodiaceae-dominated steppe in the region was established at least 13 Ma (Ma et al, 2005;Miao et al, 2011;Tang et al, 2011b). Our results provide additional information that C 4 contributions after the establishment of regional steppe landscapes approached a transient maximum at ca.…”

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confidence: 60%

Photolytic degradation of decabromodiphenyl ethane (DBDPE)

et al. 2012

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“…In the Jiuquan Basin in the western Hexi Corridor, shallow lacustrine deposits with very low sedimentary rates changed to fan delta conglomerates with fairly high sedimentary rates at 8.26 Ma [35] , conifer and broad-leaved trees degenerated and grassland expanded around 8.6 Ma [36] . In the Linxia Subbasin nearby, green and reddish brown mudstone of the Dongxiang Formation changed abruptly to yellow-brown Liushu Formation at about 8 Ma [17][18][19] , simultaneously with grassland replacing the conifer-broadleaf mixed forest [37] .…”

Section: Discussionmentioning

confidence: 99%

Miocene Bahean stratigraphy in the Longzhong Basin, northern central China and its implications in environmental change

Zhang

Song

et al. 2006

SCI CHINA SER D

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Fossil mammal-riched Neogene strata are widely distributed in the southeast corner of the huge Longzhong Basin at Tianshui, Gansu Province, northern central China. Hipparion weihoense, a typical member of late Middle Miocene Bahean stage, was recently excavated at Yaodian along a well-exposed outcrop. Owing to the importance of the Bahean stage in the mammalian evolution and its potential for environmental change, we suggested a name of Yaodian Formation for the stratigraphy, which is correlated to the Bahe Formation at Lantian, Shaanxi. High resolution paleomagnetic dating of the section shows that the Yaodian Formation covers the period between 11.67 Ma and 7.43 Ma, with the site bearing Hipparion weihoense being estimated at about 10.54-10.30 Ma, providing first magnetostratigraphic chronology for the Bahean Stage. The Yaodian Formation consists of fluvial channel deposits (11.67-10.40 Ma) at the bottom, floodplain deposits in the middle (10.40-9.23 Ma) and shallow lake sediments at the top (9.23-7.43 Ma). This upward fining sequence suggests that the relief in nearby mountain ranges such as West Qinling to the south and Huajia Ling to the north was greatly reduced after long-term denudation, fluvial transport capacity was low, and finally the drainage system was disintegrated, replaced with broad-shallow lakes in which only fine sediments like mud and marlite were deposited, indicating an old stage of development of a planation surface. A remarkable shift in ecology and climatic environment was found at 7.4-7.7 Ma when paleoclimate changed from early warm humid to late dry as indicated by sedimentary facies changed from early shallow lake sequence to late eolian red clays and a former coniferous-deciduous mixed forest was replaced by grassland, leading to great growth of Hipparion Fauna of Baodean stage in the region. Therefore, it is estimated that the present high relief of Qinling and drainage pattern did not come into being until Late Pliocene in response to intensive neotectonism and climate change.

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The vegetation and climate change during Neocene and Early Quaternary in Jiuxi Basin, China

Cited by 73 publications

References 13 publications

Regional climate model experiments to investigate the Asian monsoon in the Late Miocene

Regional climate model experiments to investigate the Asian monsoon in the Late Miocene

Photolytic degradation of decabromodiphenyl ethane (DBDPE)

Miocene Bahean stratigraphy in the Longzhong Basin, northern central China and its implications in environmental change

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