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911.
青藏羌塘盆地中、新生代火山岩同位素地球化学特征及其意义 总被引:4,自引:0,他引:4
通过对羌塘盆地火山岩(含少数侵入岩)的 锶(Sr)、钕(Nd)和铅(Pb)同位素地球化学的研究,获得中、新生代不同类型火山 岩和花岗岩类Sr同位素比值大多数为0706~0710 , 〖HT5”SS〗ε〖HT5”SS〗 N d 值 为-054~-81,均为负值, 206Pb/204Pb值为 171493~ 190313, 207Pb/204Pb值为154350~15666,208Pb/2 04Pb值为 37566~39072。根据同位素地球化学特征,中生代火山岩 物质主要 来源于富集地幔区和下地壳,原始岩浆为壳幔混合型,可能与造山带的岛弧—活动陆缘环 境 有关。早第三纪火山岩岩浆来自富集幔源区,与大陆拉张环境有关。第四纪火山岩形成于高 钾熔岩区内,与俯冲环境有关。总之,本区的火山岩中生代为造山带火山岩,新生代(主要 为早第三纪)为大陆裂谷带火山岩。 相似文献
912.
913.
水压致裂法地应力测量若干问题的探讨 总被引:4,自引:0,他引:4
在深层地应力测量中,水压致裂法是最有效的测量方法。本探讨了该方法的几个关键性问题,例如压裂特征参数的取值,三维地应力测量,压裂缝的方向,破裂准则和钻孔轴向秒是主应力的一个方向等问题。 相似文献
914.
915.
Triassic alkaline intrusives in the Yanliao-Yinshan area: their chronology, Sr, Nd and Pb isotopic characteristics and their implication 总被引:14,自引:0,他引:14
Guohan Yan Baolei Mu Baoliang Xu Guoqi He Linkun Tan Hui Zhao Zhongfu He Renhu Zhang Guangsheng Qiao 《中国科学D辑(英文版)》1999,42(6):582-587
Dated isotopic ages for 15 alkaline intrusives in the Yanliao-Yinshan area, ranging from 268 to 190 Ma, ten of which are from
250 to 208 Ma, indicate that most of them were formed in the Triassic Epoch. All the ENd(t) ratios from - 17.19 to -3.21 averaging -7.09, the ESr(t) ratios fmm 11.7 to71.5 averaging 36.63, and the Isr(t) ratios from 0.705 0 to 0.709 3 averaging 0.706 8, show their characteristics of enrichment. On the ENd
(t) virus ESr(t) correlation diagram, the samples from these intmsives were plotted within the enriched mantle trend lines and just outside,
demonstrating their close connection to materials from the enriched mantle reservoir, taking into account the same Pb isotopic
composition as that of the mantle. 相似文献
916.
917.
The age of continental roots 总被引:39,自引:0,他引:39
D. G. Pearson 《Lithos》1999,48(1-4):171-194
Determination of the age of the mantle part of continental roots is essential to our understanding of the evolution and stability of continents. Dating the rocks that comprise the mantle root beneath the continents has proven difficult because of their high equilibration temperatures and open-system geochemical behaviour. Much progress has been made in the last 20 years that allows us to see how continental roots have evolved in different areas. The first indication of the antiquity of continental roots beneath cratons came from the enriched Nd and Sr isotopic signatures shown by both peridotite xenoliths and inclusions in diamonds, requiring isolation of cratonic roots from the convecting mantle for billions of years. The enriched Nd and Sr isotopic signatures result from mantle metasomatic events post-dating the depletion events that led to the formation and isolation of the peridotite from convecting mantle. These signatures document a history of melt– and fluid–rock interaction within the lithospheric mantle. In some suites of cratonic rocks, such as eclogites, Nd and Pb isotopes have been able to trace probable formation ages. The Re–Os isotope system is well suited to dating lithospheric peridotites because of the compatible nature of Os and its relative immunity to post-crystallisation disturbance compared with highly incompatible element isotope systems. Os isotopic compositions of lithospheric peridotites are overwhelmingly unradiogenic and indicate long-term evolution in low Re/Os environments, probably as melt residues. Peridotite xenoliths from kimberlites can show some disturbed Re/Os systematics but analyses of representative suites show that beneath cratons the oldest Re depletion model ages are Archean and broadly similar to major crust-forming events. Some locations, such as Premier in southern Africa, and Lashaine in Tanzania, indicate more recent addition of lithospheric material to the craton, in the Proterozoic, or later. Of the cratons studies so far (Kaapvaal, Siberia, Wyoming and Tanzania), all indicate Archean formation of their lithospheric mantle roots. Few localities studied show any clear variation of age with depth of derivation, indicating that >150 km of lithosphere may have formed relatively rapidly. In circum-cratonic areas where the crustal basement is Proterozoic in age kimberlite-derived xenoliths give Proterozoic model ages, matching the age of the overlying crust. This behaviour shows how the crust and mantle parts of continental lithospheric roots have remained coupled since formation in these areas, for billions of years, despite continental drift. Orogenic massifs show more systematic behaviour of Re–Os isotopes, where correlations between Os isotopic composition and S or Re content yield initial Os isotopic ratios that define Re depletion model ages for the massifs. Ongoing Sr–Nd–Pb–Hf–Os isotopic studies of massif peridotites and new kimberlite- and basalt-borne xenolith suites from new areas, will soon enable a global understanding of the age of continental roots and their subsequent evolution. 相似文献
918.
919.
巢湖四条入湖河流硝态氮污染来源的氮稳定同位素解析 总被引:6,自引:1,他引:5
采用氮稳定同位素技术对巢湖四条主要污染输入河流(南淝河、十五里河、派河和双桥河)的氮污染状况和硝态氮来源进行研究.结果表明,巢湖四条入湖河流氮污染最严重的是十五里河,其次是南淝河和派河,双桥河的污染相对较轻.硝态氮的稳定同位素分析结果表明,巢湖四条入湖河流的硝态氮污染物在季节上受到不同因子的影响.十五里河和南淝河的硝态氮污染主要来源于城市生活污水和工业废水;派河的硝态氮污染在冬季主要来源于工业废水,春季来源于农业面源,而在夏季主要受到雨水的影响;双桥河的硝态氮污染冬、春季主要来源于农业面源,夏季主要受雨水的影响.此外本研究结果还表明巢湖四条主要入湖河流的氮污染源主要为铵态氮,因此今后要对铵态氮的来源进行同位素示踪. 相似文献
920.
系统整理河北省1992-2014年流动重力资料,利用LGADJ数据处理软件,对每期重力数据进行单期平差、多期整体平差计算,改正历史遗留问题,利用差分结果绘制145幅流动重力等值线差分图,通过具体异常点位及重力变化分析,得出:①地震前重力场变化强度与震级大小存在相关性;②流动重力观测资料地震前具有较为明显的前兆异常反应;③地震均发生在重力变化的“0”等值线附近地区。 相似文献