共查询到20条相似文献，搜索用时 453 毫秒
1.
正1 Introduction Lithium and its compounds as national strategic resources are extensively used in national defense,industrial and agricultural production.As we know,the salt lakes in the western of China are famous for its high 相似文献
2.
Please?refer?to?the?attachment(s)?for?more?details. 相似文献
4.
5.
6.
7.
The Late Cretaceous ükapili Granitoid including mafic microgranular enclaves intruded into metapelitic and metabasic rocks, and overlain unconformably by Neogene ignimbrites in the Ni de area of Turkey. It is mostly granite and minor granodiorite in composition, whereas its enclaves are dominantly gabbro with a few diorites in composition. The ükapili Granitoid is composed mainly of quartz, K-feldspar, plagioclase, biotite, muscovite and minor amphibole while its enclaves contain mostly plagioclase, amphibole, minor pyroxene and biotite. The ükapili Granitoid has calcalkaline and peraluminous (A/CNK= 1.0-1.3) geochemical characteristics. It is characterized by high LILE/HFSE and LREE/HREE ratios ((La/Lu) N = 3-33), and has negative Ba, Ta, Nb and Eu anomalies, resembling those of collision granitoids. The ükapili Granitoid has relatively high 87Sr/86Sr (i) ratios (0.711189-0.716061) and low εNd (t) values (-5.13 to -7.13), confirming crustal melting. In contrast, the enclaves are tholeiitic and metaluminous, and slightly enriched in LILEs (K, Rb) and Th, and have negative Ta, Nb and Ti anomalies; propose that they were derived from a subduction-modified mantle source. Based on mineral and whole rock chemistry data, the ükapili granitoid is H-(hybrid) type, post-collision granitoid developed by mixing/mingling processes between crustal melts and mantle-derived mafic magmas. 相似文献
8.
正Introduction The amount of the total dissolved salts(TDS)in most of the salt brines on northern Tibet is relatively lower.So the effective brine concentration technique is needed for lithium,boron and potassium extraction from these brine 相似文献
9.
东川矿区的地質勘探工作是从1950年7日开始的。几年來在党和上級的正确领导、苏联專家的具体帮助和全体职工的积极努力下取得了巨大的成績。不仅搞清了重点矿山,肯定了矿床規模,滿足了第一期企业设計所需要的儲量和地質資料,而且在技术水平上也有很大提高,学会并掌握了从勘探没計,到具体佈置勘探工程,取样編录,計算儲量,編写报告書一系列的工作方法。这是过去几年工作的主要方面。但是由于經验不足,技术水平不高,对新区矿床的远景評价存在着主观片面思想,工作中缺乏和忽视經济观点,因而造成不少严重的浪费。为了認真地貫彻中央勤儉办企业的方針,彻底將地質勘探工作中的浪费現象反掉,我們必须認真总結檢查过去的浪費現象,从中吸取教訓。为此,仅从技术和經济效果方面对东川历年来地質勘探工作的浪费现象作一初步总結分析。 相似文献
10.
There is a confusing situation in geostatistical literature: Some authors write variogram, and some authors write semivariogram.
Based on a formula for the empirical variance that relates to pairwise differences, it is shown that the values depicted in
a variogram are entire variances of observations at a given spatial separation (lag). Therefore, they should not be called
semivariances, and the term semivariogram should also be avoided. To name a variogram value, we suggest the use of the term
gammavariance instead of the misleading semivariance. 相似文献
11.
《矿物岩石地球化学通报》2017,(1)
<正>"遥远的东方有条龙,它的名字叫中国...我们都是龙的传人",这首歌唱遍华夏大地。但是,有多少人真正知道龙的来历与演化?龙究竟是什么东西?对于最后这2个问题,笔者将从地质学的角度大胆地提出自己现有的看法,不对之处大家可以商榷。不同的民族崇拜不同的图腾,例如,美国的图腾是鹰,刻在美国的国徽上。鹰是凶猛的食肉动物,高旋天空,以迅雷不及掩耳之势扑食地面上的其他动物。俄罗斯的图腾是北极熊,在冰雪的原野,北极熊是最强大 相似文献
12.
Please refer to the attachment(s) for more details. 相似文献
13.
14.
15.
16.
17.
18.
Keith C. Clarke 《GeoJournal》2014,79(2):129-136
This paper consists of three parts. After an introduction that stresses the historical progression of modeling methods, the motivation for urban modeling and simulation is explored, and the terms defined. Next, a meta-review of the literature is conducted, partially in an attempt to show that urban models resemble, and indeed share many overlapping issues with models in parallel fields such as economics and ecology. Lastly, the specific lessons learned from the author’s fifteen-year experience developing and supporting a cellular urban growth and land use change model (SLEUTH) are shared, in the interest of making these issues generic to current and future modeling and simulation efforts. The conclusion stresses that future models face new computing power, new theoretical paradigms, vastly improved ways of visualizing simulations, and a rapidly changing audience for modeling and simulation. 相似文献
19.
20.
Lewis Dartnell 《Geology Today》2008,24(2):62-67
The possibility of a living Mars is deeply ingrained in popular culture. The observations of the astronomer Percival Lowell, and his interpretation that these canals were built to channel melt-water from the polar regions down to the dying cities and farms huddled around the equator, are well known. Even into the 1960s, textbooks were being published that explained the temporal variation in surface brightness as due to the seasonal spread of vegetation. Martians are the science-fiction writer's alien invader of choice, from the heat-ray-wielding tripods of H.G. Wells to the bulbous-headed aggressors of Tim Burton's 1996 film Mars Attacks. With the armada of robotic probes currently orbiting and roving across the red planet, Mars has never been so forefront in the public eye. Much of this interest is focussed on the possibility that our planetary neighbour has supported an independent genesis of life, and that in certain regions it may remain habitable even to this day. A selection of some of the most recent results and discoveries concerning the astrobiological potential of Mars are discussed. 相似文献