清代大地测量兴衰研究

清代前期大地测量曾得到空前的发展,这是因为当时大地测量学在欧洲的发展和当局重视引进测绘人才和技术;但后来逐渐衰落,究其衰亡之根源:腐朽的政治制度是其根,不重视哲学、科学教育的落后的教育方式是其源。     

The changing malaria risk patterns in East-Central Europe and the North Balkans in the last 27 000 years

Southeast Europe has historically been at the crossroads of migration routes between Western Asia and Europe. In the Holocene, this area might have been home to malaria. However, it is questionable when malaria arrived in this area and whether it could persist continuously or not in the Holocene. To begin to answer these questions, the July potential generation number of two malaria parasites were modelled, based on the reconstructed mean July temperatures of 52 times in the last 27 000 years. The results indicate that in the late Pleistocene era (27–12 kya bp ), vivax malaria might have been present in the south-east Black Sea and Aegean Sea's coastal areas. Vivax malaria could also be present in the Pannonian Basin and the inner parts of the North Balkans at least from the mid-Greenlandian period (~10 kya bp ). Although it is questionable whether falciparum malaria could be endemic in the Pannonian Basin during the mid-Holocene climate optimum (~6 kya bp ), this malaria plausibly could be endemic from the Neolithic era (~12–6.5 kya bp ) in the major river valleys of the North Balkan region, millennia ahead of the Graeco-Roman times (8th century bce to 6th century ce ).     

南岭燕山期构造-岩浆热事件与锡田锡钨成矿

燕山期发生的与岩石圈减薄和构造转折有关的壳幔相互作用,引起了地球深部能量和物质向浅部的大规模传输,造成了南岭中生代构造-岩浆热事件,从而为成矿作用提供了必需的热、流体、挥发组分和成矿元素,形成了巨量金属堆积的独特地质背景。处于南岭多金属成矿带中段北缘的锡田锡钨成矿区即是在此热事件作用下,形成了云英岩型、似伟晶岩壳型、夕卡岩型、构造蚀变岩型、石英脉型锡、钨多金属矿床。     

华北石炭二叠纪煤系中I／S间层矿物的研究

华北石炭二叠煤系中的Ｉ／Ｓ间层粘土岩夹矸或粘土岩层，在太行山以东较为发育。Ｉ／Ｓ间层矿物的类型有累托石、ＩＳ有序间层矿物、Ｓ／Ｉ无序间层矿物，它们是在近岸泥岩沼泽或沼泽环境中由同期降落的火山灰蚀变而成，在酸性介质的影响下，形成ＩＳ有序间层矿物，在偏碱性的介质条件下，形成Ｓ／Ｉ无序间层矿物；高压异常区则形成累托石。     

抱板金矿带金矿床地质特征和成矿规律

矿带中的金矿床以破碎带蚀变岩型金矿为主,金矿化与蚀变作用、燕山期岩脉、NE向戈枕断裂及环形构造关系密切.矿带具有多缀控矿构造,矿床分布具有等距性.     

徐州地区二叠纪孢粉组合特征

徐州地区二叠纪地层连续，孢粉化石保存较好，依据孢粉组合特征将其划分为四个组合带，即A、B、C、D组合带，虽然其中的孢粉属种相对单凋，但可与华北大部分地区及邻区对比；此次研究的重要意义在于它是首次利用微体古生物方法划定研究区上石盒子组与石千峰组的界限.     

新疆察布查尔山早石炭世火山岩构造环境判别

察布查尔山位于伊犁-伊赛克湖微板块的南部,出露最老地层为下石炭统大哈拉军山组一套浅海相-陆相基性-酸性火山岩建造.通过岩石学,岩石地球化学分析,该火山岩整体碱度较高,碱性和亚碱性系列共存,正常类型和钾质类型共存,SiO2过饱和或低度不饱和.K2O平均含量3.4%,K2O/Na2O值多大于0.6,中基性岩Al2O3含量多大于16%.玄武岩RbN/YbN值4.5~19.9,属强不相容元素富集型.酸性岩CeN/YbN在5.2~7.2之间,显示地壳熔融特点.结合图解判别,确定早石炭世火山岩形成环境为活动大陆边缘.     

A diatom-based reconstruction of drought intensity, duration, and frequency from Moon Lake, North Dakota: a sub-decadal record of the last 2300 years

Diatom assemblages preserved in sediment cores from closed-basin lakes can provide high-resolution records of past hydrologic and climatic conditions, including long-term patterns in the intensity, duration, and frequency of droughts. At Moon Lake, a closed-basin lake in eastern North Dakota, a comparison of diatom-inferred salinity and the precipitation-based Bhalme-Mooley Drought Index (BMDI) over the last 100 years was highly significant, suggesting that the diatom record contains a sensitive archive of past climatic conditions. A sub-decadal record of inferred salinity for the past 2300 years indicates that extreme droughts of greater intensity than those during the 1930s 'Dust Bowl' were more frequent prior to A.D. 1200. This high frequency of extreme droughts persisted for centuries and was most pronounced from A.D. 200–370, A.D. 700–850 and A.D. 1000–1200. A pronounced shift to generally wetter conditions with less severe droughts of shorter duration occured at A.D. 1200. This abrupt change coincided with the end of the 'Medieval Warm Period' (A.D. 1000–1200) and the onset of the 'Little Ice Age' (A.D. 1300–1850).     

云南省元谋干热河谷的第四纪植被演化

元谋干热河谷植被呈多顶极分布格局．稀树灌草丛是一具次生性的河谷气候顶极群落，但在发生上也有一定的古老性．扭黄茅＋车桑子群落是在现代自然－人为因素强烈影响下形成的一个亚顶极群落．     

吉林省中部早石炭世杜内期的腕足动物化石

描述的化石是采自吉林省中部杜内期北通气沟组,共17个属24个种,包括3个新种。这个动物群的特点与我国南方杜内期动物群的特点不同,而与美国密西西比系金德胡克组、苏联库茨纳兹盆地和莫斯科盆地杜内期的动物群非常相像。类似的动物群在新疆、甘肃和内蒙等省和自治区均已发现。吉中地区杜内期腕足动物群,属于北美—西伯利亚古生物地理区系。