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oceanic basin相关的网络例句

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Within the closed loop of the andesite line are most of the deep troughs, submerged volcanic mountains, and oceanic volcanic islands that characterize the Pacific basin.

安山岩线是太平洋地貌中最重要的分界线,将中部太平洋盆地较深层的火成镁铁岩及大陆边沿的半沉降火成长英岩分隔开来。

This type of faulting occurs in response to extension and is often observed in the Western United States Basin and Range Province and along oceanic ridge systems.

这种类型的断层活动是由伸展作用造成的,常常在美国西部的盆岭省以及海底洋岭系统中观测到。

Based on the study of biostratigraphy and anoxic eventstratigraphy, we propose that the Qingshankou Formation may correspond to the oceanic anoxic event at the CenomanianTuronian boundary in the Cretaceous, and the age of the Qingshankou Formation in the Songliao Basin is the Late Cenomanian to the Early Turonian.

结合生物地层研究成果,认为青山口阶下部曾发生过古湖泊缺氧事件,其层位大体可与白垩纪古海洋CenomanianTuronian界线事件层进行对比,由此提出了松辽盆地青山口阶下部的时代归属于晚白垩世Cenomanian晚期-Turonian早期的新观点。

Oceanic subduction-type eclogite in the Lhasa block, Tibet, China: Remains of the Paleo-Tethys ocean basin?

青藏高原拉萨地块中的大洋俯冲型榴辉岩:古特提斯洋盆的残留?

The Lower/Upper Cretaceous boundary in Songliao Basin is,therefore,between the Quantou and Denglouku formations,instead of between the Quantou and Qingshankou formations.2.The dark mudstones and shales in the Member 1 of Qingshankou Formation are of high organic carbon and low diasteranes contents.Organic geochemical characters are illustrated by biomarkers of 28,30-bisnorhopane and gammacerane,and positive excursion of kerogen isotopes.It is suggested that the dark mudstones and shales in the Member 1 of Qingshankou Formation are the products of lake anoxic period.It corresponds to the oceanic anoxic event at Cenomanian-Turonian boundary in Cretaceous.3.Based on the study of biostratigraphy,chronostratigraphy,magnetostratigraphy and event stratigraphy,a correlation of the lacustrine sequence to marine standard has been proposed,i.e.,the Quantou Formation corresponds to Cenomanian stage,Qingshankou Formation correlates to Later Cenomanian-Early Turonian,Yaojia Formation to Later Turonian-Coniacian,Nenjiang Formation to Santonian-Campanian.Sifangtai and Minshui Formations to Maastrichtian. 4.Analysis of lithology,lithofacies and microfossils of Cretaceous in Songliao Basin, shows that shore and shallow lake facies yield the most abundant microfossil groups,and the predelta and deltaic distributary plain facies rich in fossils as well.In the shore and shallow lake areas during the high level periods(such as Qingshankou and Nenjiang sedimentary periods),the lacustrine biota are of high diversity and high abundance.

因此,松辽盆地上、下白垩统的界线应在泉头组的底界,即泉头组与登娄库组之间,而不是泉头组的顶界。2、青山口组一段黑色泥岩、页岩具有有机碳含量高、重排甾烷含量低,生物标志物出现28,30—双降藿烷和伽马蜡烷,干酷根碳同位素具有正向偏移等有机地球化学特征,表征为青山口组一段黑色页岩、油页岩是古湖泊缺氧事件的产物,它对应于白垩纪古海洋Cenomanian—Turonian期界线附近缺氧事件,二者具同步性。3、通过生物地层学、年代地层学、磁性地层学和事件地层学研究,认为泉头阶大体相当于Cenomanian阶,青山口阶相当于晚Cenomanian—早Turonian阶,姚家阶对应于晚Turonian—Coniacian阶,嫩江阶对应于Santonian—Campanian阶,四方台阶和明水阶相当于Maastrichtian阶。4、通过对松辽盆地上白垩统的岩性、岩相及微体化石分析,认为滨浅湖相是微体生物群最为发育的相带,其次为三角洲前缘相和三角洲分流平原相。

The Centr al Tethys Region lies in Hoh Xil-Bayan Har. Since Late Palaeozoic, the back-ar c bathyal basin continued to break and spread. The typical oceanic crust was event ually formed in Carboniferous and Permian. The Ocean during that period is named the Paleo-Tethys, of which the remnant is the Third and the Fourth suture zone s.

特提斯中区位于可可西里—巴颜喀喇,古生代晚期以来在弧后盆地基础上继续破裂、扩张,典型的洋壳形成于石炭—二叠纪,这个时期的洋称古特提斯,它的遗迹为第三和第四缝合带。

The volcano-sedi mentary strata,with principal part calcareous turbidites and outcroping at Juema -Bage and Zhaxi,are products of an active continental margin:the island arc tho leiite recording a subduction of the major oceanic basin of Paleotethys in early Late Triassic.

上述发现为碧土带是复杂的造山带拼贴体、古特提斯主洋盆是开阔的多岛洋和晚三叠世活动大陆边缘可能属马里亚纳型提供了重要证据。

In this area seven microfacies in the Chuangde Fm. red beds can be separated. They are: 1 reddish foraminifera grainstone; 2 reddish microfossils packstone/wackestone; 3 reddish marlstone with microfossils; 4 reddish marlstone; 5 red to variegated floatstone ; 6 reddish shales; 7 reddish radiolarite/ radiolarian chert.In the Yamudok Cuo area, it can be distinguished six microfacies in the redbeds including 1 reddish foraminifera grainstone; 2 reddish microfossils marlstone; 3 reddish shales; 4 yellow-grayish floatstone ; 5 reddish radiolarian chert; 6 reddish chert with radiolaria. The depositional environment of the Chuangde formation can be interpreted from sediments composition, as is deep oceanic basin adjacent to continental slope/rise. The slope/rise setting is indicated by the occurrence of olistoliths and slumped pelagic/hemipelagic limestone, present near the top of the Chuangde Fm.

进一步资料对比研究表明,全球上白垩统海相红层具有以下特征:a上白垩统红层出现在北大西洋、阿尔卑斯、喀尔巴阡、土耳其,向东一直到特提斯喜马拉雅地区和澳大利亚西北角的Exmouth海底高原,横贯整个特提斯和北大西洋;b沉积环境以外陆棚-斜坡和盆地为主,在斜坡环境下多发育有浊流沉积,如Scaglia Rossa和Nietrental组;c有机碳含量普遍很低,0~0.3%之间;d盆地相仅发育红色泥质岩,而斜坡和远洋环境下不仅发育红色页岩,同时还有红色泥灰岩、红色灰岩和红色硅质岩;e北大西洋和地中海地区在Cenomanian-Turonian界线黑色页岩之后不久的Turonian早期就出现红色沉积,而藏南出现在Santonian早期,Exmouth出现在Campanian早期,红层出现似乎有&西早东晚&的趋势。

I-type granite occurs on north of HongliugouLapeiquan Fault, its chemical composition is similar to that of trondhjemite arisen by Barker (1979), maybe also a product of subduction and collision of oceanic basin in early Paleozoic.

根据SiO〓-Al〓O〓和SiO〓-FeO〓/图解判别显示造山后花岗岩的特征;后者分布在红柳沟—拉配泉断裂以北,其成分与巴克尔1979年提出的奥长花岗岩的成分非常相似,也可能是区内早古生代洋盆俯冲碰撞的产物。

They not only occur in deep ocean basins such as in the central North Atlantic where they were deposited below CCD, but they extend up the continental slopes and rises, such as in the Alps, including the Gampu area , in the Carpathian Mountains (Austria, Slovakia, Poland, Romania), in Spain, in Turkey and in the Exmouth Plateau (Legs 122 and 123) in northwest Australia.The Upper Cretaceous reddish marlstones in Italy are particularly similar to the Upper Cretaceous Chuangde formation red beds in the Tibetan Himalayas. In summary, the Upper Cretaceous redbeds have several characteristic as follow:(1) very low TOC, only 0~0.3%;(2) wide distribution throughout the Neo-Tethys, from north Atlantic to the west, to Exmouth Plateau to the east;(3) Sedimentary environment of the red beds varied from oceanic basin, to slope/rise, to outer shelf. Most comment is pelagic and hemipelagic.

床得组泥灰岩〓含量0.26~5.62%,远远高于奥地利和意大利红层0.45~0.82%,并出现金属元素高含量,平均达926ppm,以高含量Ba、Cu、Zn、Cr、Ni、Th等元素为特征;2)床得组红层〓相对于定日地区同期海相碳酸盐〓整体负向偏移量达2.0‰,而在其床得组红层内部〓自下而上一直攀升,自-1.5‰~0.0‰之间上升到0.0‰~1.0‰之间;定日贡扎剖面相当于江孜床得组红层的Santonian-Campanian期,〓也出现一弱负向偏移,偏移量达-0.8‰;3)红层内锶同位素〓比值为最低值,同期定日地区也出现锶同位素低值;4)床得组部分层段的泥晶灰岩出现丰富的有孔虫,其中尤以浮游有孔虫最为繁盛,与江孜地区临近的浅海陆棚相的定日—岗巴地区此时期出现自Cenomanian-Turonian界线生物绝灭后的生物辐射期。

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