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281.
吉林省南部太古宙花岗质岩石及其成因探讨 总被引:2,自引:1,他引:2
吉林省南部早太古宙高级区和晚太古宙花岗岩—绿岩带中的英云闪长岩、奥长花岗岩、花岗闪长岩等广泛发育,各岩体分布明显受太古宙边缘穹隆及中央卵形隆起控制。在岩石化学特征上明显反映出英云闪长岩—奥长花岗岩和钙碱性两个演化趋势。经稀土模拟计算,英云闪长岩和奥长花岗岩可能由石英榴辉岩经10—40部分熔融形成。 相似文献
282.
Runsheng Yin Xinbin Feng Zhonggen Li Qian Zhang Xianwu Bi Guanghui Li Jinling Liu Jingjing Zhu Jianxu Wang 《Applied Geochemistry》2012
Zinc smelting is currently regarded as one of the most important atmospheric Hg emission sources in the world. In order to assess the potential environmental impacts of Hg from Zn smelting in China, the distribution of total Hg concentration (HgT) in Zn concentrates (ZCs) from 100 Zn deposits in China was investigated. It was found that HgT varies depending on the ore types and their geneses. Zinc concentrates from sedimentary-exhalative deposits (SEDEX, geometric mean = 48.2 μg/g) have the highest HgT. The possible explanation is that the sources of mineralizing solutions for SEDEX deposits are deep formational brines in contact with sedimentary rocks, and there are much higher background Hg contents in sedimentary rocks. Zinc concentrates from volcanic hosted massive sulfide deposits (VMS, geometric mean = 11.5 μg/g) and Mississippi Valley-Type (MVT, geometric mean = 10.1 μg/g) deposits have intermediate HgT. VMS may receive most of their Hg from fluid–rock interaction and/or by direct input of gaseous Hg from a mantle source. However, the source of metals within MVTs may be the low-temperature hydrothermal solution formed by diagenetic recrystallization of the carbonates. Intrusion related deposits (IRs) have the lowest HgT (Geomean = 2.4 μg/g), and the dispersion of Hg in the IRs seems to be influenced by the temperature of ore formation and/or the nature of wall–rock alteration. Finally, it was estimated that the annual Hg emission to the atmosphere from Zn smelting in China was about 107.7 tons in 2006. 相似文献
283.
桐柏-大别-苏鲁UHP和HP变质带的结构及流变学演化 总被引:8,自引:0,他引:8
在岩石圈流变学基本原理指导下,运用现代构造解析学方法,在不同尺度上差别和分析了桐柏-大别-苏鲁UHP和HP变质带内深俯冲,同碰撞构造及UHP和HP岩石折返过程中的变形特征,重点讨论同碰撞形成的高角度网结状榴辉岩切带阵列,高角闪岩相剪切及有关变形组合以及碰撞期后伸展韧性薄化变形样式,强调指出不同地壳层次和物理条件下变形分解作用的重要性,而且,在UHP和HP变质带内最有效的应变体制是剪切作用,并在三维空间上形成不同格式的剪切带网状系统,以构造学记录为主线,结合已有可利用的岩石学,变质作用pT轨迹和同位素年代学资料,提出一个UHP和HP变质带尺度上的流变学演化模式,其中,UHP和HP变质岩石由地幔深度折返到地壳表层,经历了楔状挤出,碰撞期后地壳韧性薄化及晚造山伸展塌陷,揭顶作用等多个阶段的动力学过程。 相似文献
284.
Helium Isotope Geochemistry of Ore-forming Fluids from Furong Tin Orefield in Hunan Province, China 总被引:3,自引:0,他引:3
Abstract. The Furong tin orefield, located in southern Hunan, China, is a newly-discovered super-large tin orefield. In contrast to most other tin deposits associated with S-type granites, the Furong tin deposit is closely associated with the Qitianling A-type granite. The 3 He/4 He ratios of fluid inclusions in pyrite and arsenopyrite from this orefield range from 0.13 to 2.95 Ra. The influence of various post-mineralization processes on the helium isotopic composition of ore-forming fluid inclusions are estimated negligible. Thus, the analytical values of helium isotopic composition basically represent the original values of ore-forming fluids at the time they were trapped.
The3 He/4 He ratios of ore-forming fluids from the Furong orefield indicate the existence of mantle-source components. It supports the idea that both the Furong tin orefield and Qitianling granite formed under the geodynamic background of mantle upwelling and crustal extension. 相似文献
The
285.
The newly discovered three alkali-rich intrusive rock belts in the Mt.Kunlun Mt.Altun region of southern Xinjiang are the Lapeiquan-Yitunbulak alkali-rich intrusive fock belt, the Gez-Taxkorgan alkali-rich intrusive rock belt and the Beeilisai-Abulash alkali-rich intrusive rock belt.The former two belts were formed during the Yanshanian period,and the third one was formed during the Himalayan period,which is the youngest alkali-rich intrusive rock belt in China.The discovery of the alkali-rich intrusive rock belts is of great significance in shedding light on the history of tectono-magmatic activities in this region. 相似文献
286.
287.
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289.
云南大坪金矿床矿化剂来源及其对金成矿的制约 总被引:17,自引:1,他引:17
本文基于对大坪金矿成矿流体中矿化剂来源、成矿时代和成矿流体形成演化过程中水-硫化剂--金耦合作用关系的研究,探讨了大坪金矿床形成的可能机制。研究结果表明,大坪金矿的成矿时代约为50Ma,金成矿所需的矿化为自深部。大坪金矿床之所以形成在喜山早期,主要是通过喜山早期富矿化剂的深源流体上升,加入原在闪长岩体内循环的贫矿化剂本,从而使这种贫矿化剂的流体转化成富矿化剂进而能够浸取金的成矿流体来实现的。 相似文献
290.
As a gasoline additive, ethyl tert-butyl ether (ETBE) has great market potential and its utilization might cause groundwater contamination problem. However,
little research has been done on its sorption in soil. In this study, the sorption characteristics of ETBE to Chinese reference
soils were studied in batch experiments. The results showed that the ETBE sorption to six soils can be described by linear
sorption isotherm. The temperature influences the sorption process of ETBE to soils. The negative sorption enthalpy (ΔH < 0) indicated that the sorption process was exothermic. Furthermore, ΔH is in a range from −8 to −32 kJ/mol. This showed that van der Waals forces and other specific interactions happened simultaneously
in the sorption process. With the increasing ionic strength, content of ETBE sorption to all soils decreased, which is probably
also an indication of other sorption mechanisms besides ETBE partitioning into soil organic carbon. 相似文献