查询词典 Ma

The lithologic characters changed from fluviolacustrine sandstone to aeolian Red Clay with thin interval of greyish-white sand layers at the depth of 602 m. It can be inferred from the rock strata and age that the development age of aeolian sequence in Lanzhou area was 7 Ma at least, which is in accordance with the bottom age (7~8 Ma) of the aeolian sequence of the eastern and central Loess Plateau, suggesting that their accumulation processes are unitary.

皋兰山剖面深度602 m处出现由河湖相砂岩向以风成红粘土为主常夹有薄层砂岩的地层转变，通过岩性地层及年代的推断，兰州地区的风尘序列堆积发育的年代至少为7 Ma，与黄土高原风尘序列堆积底界8～7 Ma基本一致，说明了兰州地区与黄土高原在风尘序列堆积过程中具有统一性。

In this paper, we report our structure observation and U-Pb zircon ages of the two types of Triassic granites, and use these data to place chronological constraints on the tectonic evolution of the western Kunlun orogenic belt. The gneissic garnet-bearing granite was crystallized at 241 Ma, whereas the horblende-bearing granite emplaced at 228 Ma.

对西昆仑西段海西晚期两类构造特征完全不同的花岗岩露头尺度的观察、锆石U-Pb定年结果表明，一类含石榴子石片麻状花岗岩形成时代为240.5±1.8 Ma，表现出同造山过程中的花岗岩变形特征；另一类块状含角闪石花岗岩的年龄为228.2±1.5 Ma。

Major element abundances of the silicate phase of the two mesosiderites are similar to those of howardites. The cosmic ray exposure ages are (242± 50) Ma for Dong Ujimqin Qi mesosiderite and (25.4± 5.0) Ma for Weiyuan mesosiderite.

东乌珠穆沁旗及渭源中铁陨石的硅酸盐相在主元素丰度上类似于紫苏钙长无球粒陨石，其宇宙射线暴露年龄分别为(252±50)Ma和(25.9±5.0)Ma。

A number of microplants with spherical, triangular, polyangular and boat-like shapes have been found both from the early Palaeoproterozoic Dashiling and Qingshicun Formations (ca. 2500- 2400 Ma) of the Doucun Subgroup of the Hutuo Group and the late Palaeoproterozoic Changzhougou and Chuanlinggou Formations (ca. 1800 -1700 Ma) of the Changcheng Group in North China. According to the features of these fossils, such as size, external shape and internal structure, they may belong to unicellular eucaryotic planktons.

在华北地区古元古代滹沱群豆村亚群的大石岭组、青石村组(约2500～2400 Ma)和长城群的常州沟组、串岭沟组(1800～1700 Ma)中存在着大直径的球形和形态呈三角形、多角形及船形微古植物，根据它们的大小、外部形态和内部结构等综合判别，它们可能属于单细胞真核浮游生物。

Firstly,~(40)Ar/~(39)Ar age clusters of Ma reveal the fast cooling of eastern Himalaya Syntaxis since middle Pliocene. Secondly, the difference of ~(40)Ar/~(39)Ar age clusters between the west and east slope section of DuoxiongLa is the result of a titling structure, which strikes NE at the west side of Namjag-Barwa– NamuLa– DuoxiongLa, and which has been functioning since 4.0~2.2 Ma under the drive of both climatic and tectonic powers.

一方面，大量小于3 Ma的~(40)Ar/~(39)Ar年龄表明东构造结的大规模隆升开始于上新世中期，另一方面，多雄拉东坡与西坡~(40)Ar/~(39)Ar年龄的差异是由于南迦巴瓦—那木拉—多雄拉峰顶连线以西发育的北东走向掀斜构造所引起的差异性抬升和剥蚀所造成，该掀斜构造开始发育于4.0～2.2 Ma期间，且一直活动到现在，其动力源自气候与构造的共同作用。

The nano-silica partrcles are organic-modified by E-MA-GMA elastomer through direct solvent process,the organic-modify process mechanism was studied,and the dispersing of modified nano-silica particles in tetrachloroethane solvent and PBT were investigated.FIRT,TEM,SEM results indicated that the epoxy group of E-MA-GMA could react with the hydroxyl groups of silica surface,helped to reduce the interactions of nano-silica particles particles and improve the dispersion of nano-silica on PBT and the interfacia...

surface modification ；溶液法利用功能化弹性体E-MA-GMA对纳米二氧化硅进行表面有机化修饰改性，分析了表面改性过程机理，同时考察了改性后纳米二氧化硅在四氯乙烷溶剂和PBT基体中的分散情况；FIRT、TEM、SEM测试结果表明，E-MA-GMA的环氧基团与纳米SiO_2的—OH基团发生反应，降低纳米二氧化硅粒子间的相互作用力，改善了纳米二氧化硅在PBT基体中的分散，提高复合材料的相容性。

The volcanic stratum has been investigated in detail and a section of the volcanic rocks has been remeasured by the authors. The ESR ages of 0.268 Ma and 0.349 Ma are obtained from the lake sandy gravel under the volcanic layer.

作者对这套火山岩地层进行了详细野外调查并重新测制了火山岩地层剖面，在该套火山岩下伏及层间湖相碎屑沉积层中获得ESR年龄0.268 Ma与0.349 Ma。

Two isolated high-velocity anomalies are imaged in and below the mantle transition zone, which are interpreted as the Pacific slab detached about 2 Ma ago and the Komandorsky lithosphere subducted about 10 Ma ago.

在地幔过渡带内和过渡带的下方发现了两块高速异常体，分析认为它们分别是2 Ma前脱落的太平洋板块岩石圈和10 Ma前俯冲的Komandorsky板块。

Compared to MA, BSAP has the following advantages: cancels the open operation of MA and adds the traffic operation primitive between ambients and their sub- ambients; adds operation and adds password to operation; adds the operation primitive of ambient reclamation.

相对于MA，BSAP做了如下几点改进：1、取消了MA中的操作，增加了父子环境间的通信操作原语；2、增加了操作，并在操作中加入了密码；3、增加了环境回收操作原语。

The 40Ar/39Ar isotopic dating of amphiboles collected from different depths of core samples in No. 3 intrusion gave a (228.2±3.0) Ma plateau age and a (230.1±7.1) Ma isochron age.

本次工作对采自不同深度岩心样品中的单矿物角闪石进行40Ar/39Ar同位素年代学研究，得到(228.2±3.0)Ma的坪年龄和(230.1±7.1)Ma的等时线年龄。

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。