[Objective] The research aimed to analyze variation characteristics of the temperature and precipitation in north slope area of the Western Tianshan in recent 50 years.[Method] According to temperature and rainfall da...[Objective] The research aimed to analyze variation characteristics of the temperature and precipitation in north slope area of the Western Tianshan in recent 50 years.[Method] According to temperature and rainfall data from 1961 to 2010 at three meteorological stations in north slope area of the Western Tianshan,climate change in the zone in recent 50 years was analyzed by using linear trend analysis method and 5-year sliding average method.[Result] The temperature in north slope area of the Western Tianshan showed significant warming trend.The annual average temperature significantly increased at 0.3 ℃/10 a in recent 50 years.But rise rates of the temperature in different seasons were different:autumn> winter> spring> summer.The annual rainfall in north slope area of the Western Tianshan in recent 50 years overall presented relative increase trend.Seen from annual rainfall,it significantly increased at 16.9 mm/10 a.Seen from seasonal rainfall,except in autumn,rainfalls in other three seasons in the past 50 years all showed significant increase trends,with amplitude of 3.2-11.2 mm/10 a.The largest increase amplitude was in summer.After a small precipitation peak in the 1980s,autumn rainfall slightly declined in the past 20 years.[Conclusion] The climate in north slope area of the Western Tianshan become warm and wet.展开更多
基金Supported by General Item of the Science and Research Plan of Yili Normal University (2011YNYB036)
文摘[Objective] The research aimed to analyze variation characteristics of the temperature and precipitation in north slope area of the Western Tianshan in recent 50 years.[Method] According to temperature and rainfall data from 1961 to 2010 at three meteorological stations in north slope area of the Western Tianshan,climate change in the zone in recent 50 years was analyzed by using linear trend analysis method and 5-year sliding average method.[Result] The temperature in north slope area of the Western Tianshan showed significant warming trend.The annual average temperature significantly increased at 0.3 ℃/10 a in recent 50 years.But rise rates of the temperature in different seasons were different:autumn> winter> spring> summer.The annual rainfall in north slope area of the Western Tianshan in recent 50 years overall presented relative increase trend.Seen from annual rainfall,it significantly increased at 16.9 mm/10 a.Seen from seasonal rainfall,except in autumn,rainfalls in other three seasons in the past 50 years all showed significant increase trends,with amplitude of 3.2-11.2 mm/10 a.The largest increase amplitude was in summer.After a small precipitation peak in the 1980s,autumn rainfall slightly declined in the past 20 years.[Conclusion] The climate in north slope area of the Western Tianshan become warm and wet.
文摘北天山西部温泉岩群是一套经历多期次变形、变质作用的中深变质岩系。温泉岩群中斜长角闪片麻岩及方解大理岩的尼格里值al满足alk+c>al>alk,t<0,属正常系列岩石;泥质-长英质变质岩的尼格里值al>alk+c,t>0,SiO 2含量61.79%~74.93%,Al 2 O 3含量13.49%~17.94%,FeO含量1.00%~2.54%,属铝过饱和系列。微量元素Zr富集,Sr、P、Ti、Ba亏损,显示近源沉积的特点。轻重稀土比值4.31~6.86,(Ce/Yb)_(N)为3.47~5.46,(La/Yb)_(N)为3.67~6.52,比值大于1,属于轻稀土富集型。δEu为0.32~1.02,其中泥质-长英质变质岩铕亏损明显。根据详细的显微观察,结合地球化学特征,认为温泉岩群原岩建造主要为陆源碎屑沉积建造,夹有少量的碳酸盐岩和中基性火山岩;其中斜长角闪片麻岩的原岩为玄武岩-玄武安山岩,片岩的原岩为粘土岩,变粒岩及混合岩的原岩为杂砂岩或亚杂砂岩,方解大理岩的原岩为碳酸盐岩。古元古代温泉地区以沉积岩建造为主,并发育有一定强度的火山活动,在强烈挤压背景下,该套地层发生强烈变形变质,产生区域动力热流变质作用,形成温泉岩群变质岩。
