早白垩世

浙江早白垩世晚期火山活动与火山&沉积岩系地层划分

Volcanic activities and stratigraphic division of volcano-sedimentary rocks during late period of Early Cretaceous epoch in Zhejiang

早白垩世以来长2和长6的油势演化历史可分为早白垩世、晚白垩世至今两个阶段。

The evolution history of oil potential in Chang-2 and Chang-6 oil layer sets since early Cretaceous can be divided into two stages , which are early cretaceous epoch and late cretaceous epoch to now .

在北非不同的地方使用这个名称，包括从石炭纪到早白垩世的地层。

The term is used at various localities in North africa , includes beds ranging from Carboniferous to early cretaceous .

华北克拉通北缘早白垩世岩石圈减薄：钾玄岩的Pb同位素证据

Early Cretaceous Lithospheric Thinning of Northern Margin of the North China Craton : Evidence from Pb Isotope of Shoshonite

赣杭带早白垩世粗面岩锆石SHRIMPU-Pb年龄及其意义

Early Cretaceous Zircon SHRIMP U-Pb Age of the Trachyte and Its Significances of the Gan-Hang Belt

锆石SHRIMP和LA-ICP-MSU-Pb定年结果表明它们形成于早白垩世（130~132Ma）。

SHRIMP and LA-ICP-MS zircon U-Pb dating indicate that the suite was formed in the early Cretaceous ( 130 ~ 132 Ma ) .

单颗锆石U－Pb年龄测定表明桐庐火山－侵入岩是早白垩世火山活动的产物（134.4～134.9Ma）。

U Pb age determinations of single zircon show that the Tonglu volcanic intrusive rocks are the products of Early Cretaceous volcanic activities ( 134 4 ~ 134 9Ma ) .

郯庐断裂带内一系列走滑糜棱岩类的~（40）Ar/~（39）Ar测年表明，郯庐断裂早白垩世发生了左旋走滑运动。

The 40Ar / 39Ar values of the mylonite series from the Tan-Lu fault belt demonstrate that the fault belt has experienced sinistral strike-slip movement in the Early Cretaceous .

郯庐断裂带早白垩世火山岩的K-Ar年龄及其构造意义

K-Ar dating of Early Cretaceous volcanic rocks along the Tan-Lu fault zone and its tectonic significance

火山岩中锆石的U-Pb年龄为（129.2±2.6）Ma，属早白垩世。

The U Pb dating of zircon from the volcanic rock is ( 129.2 ± 2.6 ) Ma , belonging to Early Cretaceous .

该区早白垩世的主要构造行迹为NE向和NW向的断裂构造；这些断裂构造控制着火山沉积盆地的边界和一些火山机构的分布。

The main structures of Early Cretaceous in the area are NE and NW faults , which control not only the major boundaries of the basins , but also some volcanic edifices .

自早白垩世至第四纪发育了3个各具特点的沉积旋回，早白垩世沉积的AG组湖相富含有机质的泥岩、页岩分布广泛，评价为好&极好烃源岩；

There has been three sedimentary cycles developed from Cretaceous to Quaternary . AG Formation lacustrine facies shale and claystone deposited during early Cretaceous is of organic rich , which is rated as good to excellent source rock .

在早白垩世滨太平洋构造活动中，该断裂进一步向北延伸，发生了约200km的左行平移。

During the activity of the fault zone in the Early Cretaceous , it extended further north and had left-lateral displacement of ca. 200 km .

义县组形成于135～120Ma期间，属于早白垩世。

The Yixian formation was formed during the period of 135 to 120 Ma , i.

肥东韧性剪切带中糜棱岩、超糜棱岩测得的~（40）Ar/~（39）Ar全岩年龄分别为120.48Ma和118.75Ma，说明郯庐断裂带的大规模左行平移时代为早白垩世。

The mylonite and ultramylonite in the ductile shear zones yield whole-rock 40Ar / 39Ar ages of 120 . 48 Ma and 118 . 75 Ma respectively , which suggest that large-scale sinistral displacement in the Tan-Lu fault zone took place in the Early Cretaceous .

基于AFT曲线的温度分带模式和流体包裹体测温数据的综合约束，推算合肥盆地早白垩世走滑压陷阶段的古地温梯度接近67℃/km。

Based on the temperature-dividing model of the AFT curve with temperature constraints from fluid inclusions , the estimated geothermal-gradient of the Hefei wrench-compressive basin during the Early Cretaceous was about 67 ℃ / km .

早白垩世时期，构造体制以引张伸展活动为主，引张应力方向为NWSE至近WE向，沿断裂带形成一系列深而狭长的断陷盆地；

The tectonic stress regime changed to extension during the Early Cretaceous and the Muping Jimo fault zone was dominated by normal faulting which resulted in formation of deep and narrow fault-down troughs . The direction of extension during this period was NW SE to W E.

锆石U-Pb同位素测定显示，该岩体不同岩相岩石具有大体一致的年龄，其形成于120～130Ma的早白垩世，而不是以前认为的三叠纪。

Zircon U-Pb isotopic dating for different petrographic rocks gives similar emplacement ages ( 130 ~ 120 Ma ), i.e. , the Early Cretaceous , not the Triassic as previously thought .

而早白垩世在NE-SW向拉伸应力场作用下，额尔古纳地块东部形成拗陷带，火山基底构造为NE-NNE向。

But under the control of NE-SW tensile stress field of Early Cretaceous , in the eastern part of Ergun Block sag belt was formed and the basement tectonics is NE-NNE direction .

矿区出露的二长斑岩脉单颗粒锆石U-Pb年龄为133.7Ma～131Ma，表明岩浆侵位时间发生在晚侏罗世&早白垩世，属燕山中晚期岩浆活动的产物，属成矿后侵位的岩浆岩。

The single zircon U-Pb of 133.7Ma ~ 131Ma for monzonite-porphyry in the orefield make clear that the magma was intruded after mineralization during Late Jurassic to Early Cretaceous Period .

径迹年龄分布、AFT曲线拐点年龄和区域抬升剥蚀时间的对比分析结果表明，合肥盆地在早白垩世构造热事件之后的104Ma以来总体处于抬升冷却过程，后期快速抬升冷却事件主要发生在±55Ma。

The fission track ages and the AFT curve break age , as well as the regional uplift-erosive time , reveal that the uplift-cooling process following the tectonic-thermal event has developed since 104 Ma and a later rapid uplift-cooling event occurred mainly around ± 55Ma .

结果中卫探区ZW1地震剖面上发育大型的逆冲推覆构造，该逆冲推覆构造形成于晚侏罗世至早白垩世时期。

Results Large thrust nappe structure was developed along ZW1 seismic survey line , and it was formed during Late Jurassic to Early Cretaceous .

初步认为该岩石圈减薄发生在晚中生代，且在120～130Ma的早白垩世达到高潮。

It is suggested that the lithospheric thinning took place in the Late Mesozoic , and maximally thinned in Early Cretaceous ( 120 ~ 130 Ma ) .

早白垩世的盆地在区域伸展的环境中形成了NNE向的断陷盆地，盆&山耦合仍是高处剥蚀、低处充填的浅层次的填平补齐关系。

In early Cretaceous the basin was developed as the fault basin with NNE direction in the environment of regional extension , and the coupling relationship of basin-mountain still was the shallow level one ; the high place was denuded and the low place was filled .

其中斑状花岗闪长岩（TW1530）的SHRIMP锆石U-Pb年龄为117.2±1.6Ma，黑云母花岗岩（TW1637）年龄为121.2±1.7Ma，表明桑巴区花岗岩体形成于早白垩世。

The SHRIMP U-Pb dating results of zircons from porphyritic granodiorite ( TW1530 ) and granitite ( TW1637 ) are 117.2 ± 1.6 Ma and 121.2 ± 1.7 Ma , respectively , suggesting that Sangba granitoids were formed in early Cretaceous .

侏罗纪末～早白垩世初的火山活动除有熔岩（146Ma，137Ma）喷出外，还发育有辉长岩侵入体（135Ma）和辉绿岩岩墙（129Ma）等次火山岩。

The Late Jurassic-Early Cretaceous activity produced basaltic and basaltic andesitic lavas ( 146Ma , 137Ma ), followed by gabbro intrusion ( 135Ma ) and aplite dyke ( 129Ma ) .

渤海地区中侏罗世和早白垩世孢粉组合

Sporo-pollen assemblages of Middle Jurassic and early Cretaceous in Bohai region

黑龙江省东部早白垩世的一些海相和半咸水相腹足类

Some early Cretaceous marine and brackish-water gastropods from Eastern Heilongjiang Province

内蒙古二连盆地西部早白垩世介形类

Early Cretaceous Ostracoda from the Western eren basin , Nei Mongol

其中早白垩世末为天然气成藏关键时期。

And the late early Cretaceous was the key accumulation time .