干旱区生态环境知识资源中心(Arid): 甘肃西部花海子盆地第四纪介形类Subulacypris

Arid

	甘肃西部花海子盆地第四纪介形类Subulacypris
其他题名	QUATERNARY SUBULACYPRIS (OSTRACODA) FROM THE HUAHAIZ BASIN, WEST GANSU, CHINA
	杨藩; 路艳丽; 乔子真
来源期刊	微体古生物学报
ISSN	1000-0674
出版年	2013
卷号	30 期号:4 页码:389-404
中文摘要	本文记述了花海子盆地第四纪介形类动物群中占绝对优势的Subulacypris,共7个种,其中新种4个。依据该属种产出层特性及其在介形类动物群中的分布特征推测,适于这些种的生活环境应属严寒气候条件下的冰水河流,化石壳体微量元素分析结果提供的环境信息与这一推测相吻合。
英文摘要	The Huahaiz Basin(Suganhu Basin),lying in the west of Gansu Province, China,is surrounded by the Altun Mountains and the Qilian Mountains where the rocks are constitute of Pre-Mesozoic. It is an intermountain basin in the far west of the Qinghai-Xizang (Tibet) Plateau, with the elevation of 2 800-3 200 meters. The annual mean temperature at the west of the basin is 2. 75℃,the mean annual precipitation, 18. 7 mm, and the evaporation, 2 967. 2 mm. The basin is under the influence of the highland frigid climate of the arid region. The surface sediments in the basin are considered to be Late Pleistocene and Holocene in age. In this paper,the ostracod genus SubuLacypris (with 7 species) that collected from 8 hydrological holes (Fig. 1) and 4 petroleum-exploratory wells (Well Sutanl, Su2,Su3 and Sucl,located in the area between Hole ZK29 and Huahaiz Village) in the basin, is identified and described,among these species, four are new. In the holes and wells above-mentioned, Hole ZK29, a representative, is the hole in which the SubuLacypris range-zone(34-299 m) is the longest and the numbers of valves and carapaces of the genus in the zone are the highest. At the section of Hole ZK29,Ilyocypris sebeiensis Yang occurred in 36-38 m, concurred with a few Subulacypris postitruncata. While beneath the zone, Eucypris rischtanica Schneider appeared in 335. 2-337. 2 m (Table 1). I. sebeiensis is confined to the Pleistocene in the Qaidam Basin (Yang etal., 2004); E. rischtanica ranges in age from Mid-Pleistocene to Holocene in Tibet, China (Hou etal.,2002) and of Quaternary in the lake Issyk-kul (Kyrgyzstan) and the Fergana Basin (Uzbekistan)。After the comprehensive analysis of the above information, the authors think that Subulacypris range-zone is held to be Pleistocene in age. Owing to the fact that Potamocythere nanhong-gouensis Yang et Cao,the species ranged in age from the Middle to Late Pleistocene in the Qaidam Basin (Yang et al., 2011),is concurred with a large number of the Subulacypris specimens at the middle part of the zone of the Hole ZK30 (133. 52-135. 52 m),it is quite possible that the Subulacypris range-zone is confined to the Middle-Late Pleistocene. The phenomenon that Subulacypris is the dominant or the only genus in the ostracod assemblage (Table 1), suggests that the genus thrived in an extremely special environment which most ostracod species are difficult to adapt to. As shown in Table 1,Subulacypris species occur in yellow sand and soil (none of saline deposit) and associate with Cytherissa lacustris,a cold freshwater species (Yang et al., 1991), it is quite possible that the environment is a fluvioglacial river. This inference can be supported by the datum that the fluvioglacial deposits of Pleistocene age are widespread in the study area (Cao, 1997),and can be justified by the strong similarity between the shell trace element of Subulacypris postitruncata and Qinghaicypris crassa (Table 2),as the latter is a cold freshwater species (Yang etal.,2004).
中文关键词	介形类 ; 第四纪 ; 冰水河 ; 花海子盆地 ; 甘肃
英文关键词	Subulacypris Ostracoda Subulacypris Quaternary Huahaiz Basin Gansu Province China
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5023610
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230265
作者单位	青海油田公司勘探开发研究院, 敦煌, 甘肃 736202, 中国
推荐引用方式 GB/T 7714	杨藩,路艳丽,乔子真. 甘肃西部花海子盆地第四纪介形类Subulacypris[J],2013,30(4):389-404.
APA	杨藩,路艳丽,&乔子真.(2013).甘肃西部花海子盆地第四纪介形类Subulacypris.微体古生物学报,30(4),389-404.
MLA	杨藩,et al."甘肃西部花海子盆地第四纪介形类Subulacypris".微体古生物学报 30.4(2013):389-404.