Untitled

from marine clastics to carbonates. The firstlithofacies mainly composed of clastics, whereasthe second contains carbonate-dominated sediments.The Lower Tertiary sequence unconformablyoverlies an irregular surface composedof ophiolitic rocks, deep marine bedded chertsand carbonates of early Mesozoic age, Mesozoiccarbonates and marine clastics and carbonates ofLate Cretaceous age. The unit is unconformablyoverlain by Lower Miocene marine clastics.Both the unconformity and tectonic relationshipsbetween the Eocene and Lower Miocene sequencesare seen in the northern study area.These exposures are proof of pre-Miocene erosionand post-Miocene deformation. In this study,two nannofossil interval zones, NP12 and NP13,were identified from fine-grained clastics andcarbonates. According to benthic foraminiferaand nannofossil contents, the formation is EarlyEocene (Ypresian) in age. The percentages ofreworked (older) fossils range from 75% in thelower levels to 15% in the higher levels of theLower Tertiary sequence. This study demonstratesthat detailed analyses of fossil reworkingare needed in order to obtain more reliable results.The evidence of strong reworking, planttraces, biostratigraphical and sedimentologicaldata indicate that a single cycle of Early Eocenesedimentation occurred in a shallow to openmarinedepositional environment, becomingshallower as time progressed. The obtained dataindicate a marine transgression from north tosouth in the northern part of the Isparta Angleduring Eocene time.2008040578尼 泊 尔 中 部 塔 科 拉 盆 地 中 全 新 世 古 土 壤 及 其古 气 候 意 义 = Paleosols of middle Holocene agein the Thakkhola basin, central Nepal, and theirpaleoclimatic significance. ( 英 文 ). Saijo K; TanakaS. Journal of Asian Earth Sciences, 2003,21(3): 323-329The characteristics and climatic implication ofpaleosols widely distributed in the Thakkholabasin, upper Kali Gandaki, central Nepal, wereinvestigated. The paleosols were buried in surficialdeposits of eolian or colluvial origin. Theywere composed not only of humus, but also includedabundant inorganic matter. Some of themyielded charcoal fragments, pollen, and phytoliths.Radiocarbon dating suggested that the paleosolsformed between 6200 and 4500 yr B.P.,i.e. during the middle Holocene. The paleosolsare interpreted to indicate stronger summer monsoonsand increased rainfall at the time of theirformation. The vegetation cover at that time isthought to have been relatively dense. Charcoal,plant fossils, and carbon isotope data suggestthat grasslands were dominant in the northernpart of the basin while trees grew in the southernmostpart during the period of paleosol formation.The paleosols were buried by surficialdeposits under drier climatic conditions after4500 yr B.P.2008040579根 据 印 度 河 三 角 洲 大 陆 边 缘 沉 积 的 孢 粉 资 料推 断 巴 基 斯 坦 3 万 年 以 来 的 植 被 史 和 古 气 候= Vegetation history and palaeoclimate of thepast 30 kyr in Pakistan as inferred from the palynologyof continental margin sediments off theIndus Delta. ( 英 文 ). Ansari M H; Vink A. Reviewof Palaeobotany and Palynology, 2007,145(3-4): 201-216Palynological investigations on a continuousuppermost Pleistocene to Holocene highresolutiongravity core collected from the continentalmargin off the Indus Delta provide thefirst, uninterrupted, 30-kyr-long record of vegetationhistory and palaeoclimate of the Pakistanhinterland. Core analysis and interpretation allowsthe recognition of (1) greater glacial ariditythan during the following postglacial period upto the present day; (2) a significant southwardextension of the Himalayan sub-alpine and deciduoushardwood tree zone during the time intervalfrom the Last Glacial Maximum (LGM) tothe Younger Dryas cold interval; (3) extremearidity and climatic deterioration during theLGM and the equivalent to Heinrich event 1; (4)a marked change to early Holocene humid conditions,starting already during the Bölling/Allerödand increasing abruptly during thePreboreal period; and (5) a gradual reduction ofhumidity from the middle Holocene to the present.These results are in general agreement withpalaeoclimatic reconstructions based on multipleproxies from the Indian subcontinent as well asthe Arabian Sea, and especially confirm the occurrenceof a clear precipitation maximum inPakistan between ca. 9 and 7 cal. kyr BP whichprobably resulted from a combination of increasedand prolonged summer (SW) monsoonalstrength; both processes ultimately being controlledby orbital changes in northern hemispheresummer insolation and shifts in the positionof the Intertropical Convergence Zone.2008040580全 新 世 时 期 鄂 霍 次 克 海 北 部 大 陆 架 古 环 境 变化 = Paleoenvironmental changes in the northernshelf of the Sea of Okhotsk during the Holocene.( 英 文 ). Gorbarenko S A; Tsoi I B; Astakhov A S;Artemova A V; Gvozdeva I G; Annin V K.Stratigraphy and Geological Correlation, 2007,15(7): 656-671The combined micropaleontological (sporesand pollen, diatoms, benthic foraminifers),lithologic, and isotopic-geochemical analysis of175