塔里木盆地阿克苏沙井子地区康克林组沉积特征

塔里木盆地阿克苏沙井子地区康克林组为晚石炭世－早二叠世的一套碳酸盐与陆源碎屑混合沉积物，其岩性自下而上可分为：第一岩性段主要为石英砂岩、粉砂岩夹砾岩和砾屑灰岩；第二岩性段主要为灰岩与细砂岩或粉砂岩互层；第三岩性段主要为生屑灰岩、核形石灰岩夹砂屑灰岩。根据混合沉积物中碳酸盐和陆源碎屑的相对含量及组构特点可将其划分为八种形式：①碎屑岩夹灰岩；②碎屑岩与灰岩互层；③灰岩夹碎屑岩；④陆源碎屑散布于碳酸盐基质之中；⑤碳酸盐作为碎屑岩的填隙物；⑥碳酸盐颗粒散布于陆源碎屑之中；⑦陆源碎屑砾石与碳酸盐颗粒混合沉积；⑧陆源碎屑砾石和碳酸盐颗粒散布于碳酸盐基质之中。通过对混合沉积物形成机制的分析认为，混合物主要形成于潮坪至台地环境，海平面的变化严格控制着混合物的类型，碳酸盐沉积与海平面上升密切相关。     

吐哈盆地托克逊地区二叠系—侏罗系分布概况及古生态古气候初探

通过对吐哈盆地托克逊地区二叠系、三叠系、侏罗系的野外剖面实地观察及大量化石鉴定成果的综合分析,认为该区地层发育不全,侏罗系源岩的区域性盖层齐古组(Ｊ3ｑ)缺失,局部性盖层残缺不全。该地区的主力源岩应以上二叠统和三叠系为主。同时通过对中生代淡水瓣鳃类、脊椎动物的研究,对该区晚三叠世—侏罗纪古生态环境及古气候变迁进行了初步探讨     

塔里木盆地南部早二叠世孢粉组合及植物区系

塔里木盆地南部早二叠世孢粉植物群可分为Striolatospora-Qipanapollis(SQ)组合和Potonieisporites-Vestigisporites(PV)组合,时代为早二叠世早、中期.对孢粉植物群特征的分析表明,在早二叠世早、中期,属于欧美植物群范畴,并非以往所认为的属于华夏植物群,也未发生所谓的四大植物区系的混生现象.对塔里木地块当时古地理位置的讨论结果亦支持这一结论.     

A new method to prepare clean cuticular membrane from fossil leaves with thin and fragile cuticles

Leaf cuticle analysis has long been a powerful tool for fossil plant identification,systematics,and palaeoclimatological recon-struction.In recent decades the application of stomatal frequency data that are relied on precise calculation of stomata on plant fossil cuticles to reconstruct ancient atmospheric CO2 concentration made the preparation of cuticular membrane with suffi-cient size a critical technique in palaeoclimatological research.However,for plants with originally thin and fragile cuticles,e.g.,m...     

对准噶尔盆地南缘上白垩统分布的新认识

通过对准噶尔盆地南缘重点探井的跟踪研究，于多口探井中相继发现了晚白垩世介形类动物化石，这些化石点在面上的不断增多，为研究盆地南缘上白垩统分布提供了相当重要的古生物化石依据。现有资料表明，准噶尔盆地南缘晚白垩世沉积不限于东沟组一套沉积物，还表明南安集海河以西无疑存在上白垩统     

塔北轮南地区晚奥陶世粉屑岩隆礁研究

在塔里木盆地北部首次发现了主要由蓝绿藻和钙质海绵组成的晚奥陶世生物礁。研究表明，本区礁体的类型分为藻粘结粉屑岩隆礁和钙质海绵－蓝绿藻障积－粘结粉屑岩隆礁。通过对礁体古生态的研究，识别出蓝绿藻群落和钙质海绵群落，并阐述了其演化过程。礁体的成因和机理研究表明，本区礁体是生物和水动力共同作用的结果，体现为藻粘结、钙质海绵的障积以及机械沉积的共同作用。本区礁体经历了奠基、粘结、障积－粘结和衰亡四个阶段，且礁体的演化明显受环境的制约。     

Anatomical variations of living and fossil Liquidambar leaves:A proxy for paleoenvironmental reconstruction

Based on living L.formosana,we have established that such epidermal cell properties as epidermal cell circumference(Circum.) ,undulation index(UI) ,epidermal cell area(EA) on both upper and lower epidermis and the corresponding epidermal cell density(ED) ,are suitable to differentiate between sun and shade leaves.Also,stomatal properties on the lower epidermis,including stomatal length(SL) ,stomatal pore length(PL) and the corresponding stomatal density(SD) ,are reliable parameters to identify sun/shade mor...     

Jurassic rocks,bivalves,and depositional environments of the source area of the Yangtze River,Qinghai Province,western China

Jurassic rocks are abundantly developed in the source area of the Yangtze River,South Qinghai,with the greatest thickness of 6311 m,including five stratigraphic units:Qoimaco Formation,Buqu Formation,Xiali Formation,Suowa Formation,and Xueshan Formation.Based on sufficient fossils of bivalves,ammonites,and brachiopods,the major part of these formations is ascribed to the Middle Jurassic Bathonian to Callovian.No diagnostic fossils have been found from the Lower Qoimaco Formation or Upper Xueshan Formation,w...