查询词典 cretaceous

Ma (early epoch of early Cretaceous) mafic dikes from south and north Jiangxi province, respectively, are available to comparative geological and geochemical discuss reveal that they are related to curst extension event and distinguish between rock series and trace element and isotopic characteristics of mafic dikes from south and north Jiangxi.

对赣南大吉山地区和赣北地区早白垩世基性岩脉的地质地球化学特征进行了系统的研究，表明它们可能代表中国东南部早白垩世初存在一次重要的岩石圈伸展和地壳拉张事件。

The thrust fault cut and reformed the Early-Middle Jurassic sedimentary strata and is covered by the Early Cretaceous sedimentary strata, indicating that the thrust fault was formed between the deposition of Early-Middle Jurassic Series and Guyang Formation.

断层切割改造了早－中侏罗世沉积地层，被早白垩世沉积地层覆盖，表明了逆冲断层形成在下中侏罗统沉积之后白垩系固阳组沉积之前。

The thrust fault cut and reformed the Early-Middle Jurassic sedimentary strata and is covered by the Early Cretaceous sedimentary strata, indicating that the thrust faultwas formed between the deposition of Early-Middle Jurassic Series and Guyang Formation.

断层切割改造了早-中侏罗世沉积地层，被早白垩世沉积地层覆盖，表明了逆冲断层形成在下中侏罗统沉积之后白垩系固阳组沉积之前。

Based on plentiful isotopic dating data and geological studies, the authors, in this paper, discuss the geological meanings of the two isotopic ages given by Lapierre et al., and conclude:① Mesozoic volcanic activities in Zhejiang are most frequent in 130～83 Ma, that is, from the early to late Cretaceous but not the late Jurassic;② The Jiande and Moshishan groups are nearly in the same period and not in an upper—lower stratigraphic relationship with each other;③ The period of 110～100 Ma is a transitional stage from the early high-K calc-alkaline dacite—rhyolite associated with diorite—granodiorite） to the late basalt—rhyolite（associated with K-feldspar granite—alkali granite）.

本文就Lapierre等文中124 Ma和97 Ma两个年龄的地质意义、幕次划分以及浙西与浙东火山岩时代对比作出评论，并厘定浙江中生代火山岩时代归属，提出：①浙江中生代火山活动时代为132～83 Ma；②浙西建德群与浙东磨石山群火山岩并不存在上下关系，地质接触关系、古生物组合和大量同位素定年数据都不支持Lapierre等的浙西与浙东火山活动幕次的对比方案；③ 110～100 Ma为早期高钾钙碱性英安岩—流纹岩（伴生闪长岩—花岗闪长岩）向晚期玄武岩—流纹岩（伴生钾长花岗岩—碱性花岗岩）过渡的转折期。

Early Cretaceous granitic volcanic-intrusive complex in Xiushanlinchang of northeastern Da Hinggan Mt. consists mainly of rhyolite, rhyolite ignimbrite-trachytic dacite, trachyandesite formed in eruptive cycle stage and adamellite porphyry-geode syenogranite-graphic alkali feldspar syenogranite formed in hypabyssal invasion stage.

大兴安岭东北部秀山林场一带的早白垩世花岗质火山－侵入杂岩体由喷发旋回期的流纹岩、流纹质熔结凝灰岩－粗面英安岩、粗安岩和浅成侵入期的二长花岗斑岩－晶洞正长花岗岩－文象碱长正长花岗岩构成。

The foreland basin phase was controlled mainly by the thrust of Qinlin-Dabie orogenic area during later Jurassic and middle Triassic;the rift basin phase is controlled by fault and deasil circumvolving with the change of stressing during Cretaceous and Paleocene,with strong magma activity;and in the depression basin phase the bas...

盆地地壳结构和小震分布及震源机制解显示地震集中在沉降最大的潜江—沔阳凹陷带附近，震源深度优势分布在15 km左右，即盆地基底附近。

Dinosaurian egg is a kind of peculiar and precious fossil in the Late Cretaceous strata, which are well－developed and widely distributed in nearly 30 basins of varied sizes and shapes in Jiangxi.

恐龙蛋是晚白垩世地层中一类特殊而又珍贵的化石。江西晚白垩世地层分布广泛，发育良好，散见于大小不一、形态各异的近30个盆地中。

The dual structure of the complex fault depression in Songliao Basin and its geologic historic construction determined the existence of two sets of petroleum systems and their differences. The deep fault-depression group developed during Late Jurrasic to early Cretaceous and the particularity of the constructions of its inside sedimentary rock and volcanic rock determined the particularity of the natural gas enrichment conditions.

松辽盆地断拗复合的二元结构及独特的地质演化特征，决定了2套油气系统的存在和差异；晚侏罗－早白垩形成的深部断陷群及其内幕沉积岩和火山岩建造的特殊性，决定了天然气富集条件的特殊性。

This story, though, raises the question of why there is but a single ejecta layer of iridium and shocked quartz in late Cretaceous rocks around the world.

然而，这却引发了一个问题：为什么全世界只有一个白垩纪后期的铱和受震石英熔岩层。

I am on an Oligocene beach, an Eocene beach, a Cretaceous beach -- the scene is the same.

我正在渐新统的海滩上，或在始新世的海滩上，或在白垩纪的海滩上——场景不变。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。