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1.
河南省地热资源类型按照所处的大地构造环境分为沉积盆地型和隆起山地型。计算结果表明,沉积盆地区4 000 m以浅储存的地热水总量为82 063.23×10~8 m~3,储存热能总量为7 734 086.01×10~(12) kJ。不考虑回灌时,全省沉积盆地型地热可采流体量为92 223.93×10~4 m~3/a,可利用热能量196.6×10~(12) kJ/a;考虑回灌时,全省沉积盆地型地热流体可开采量5 931 841.92×10~4 m~3/a,可利用热能量为13 003.47×10~(12) kJ/a。统计分析显示,按地热流体可采量为92 223.93×10~4 m~3/a、地热流体可开采热量196.46×10~(12) kJ/a计算,即使按50%利用,其经济效益也是十分可观的。另外,地热开发可带动第三产业经济的发展,产生的间接经济效益更加巨大。 相似文献
2.
P. Nagaraju Labani Ray G. Ravi Vyasulu V. Akkiraju Sukanta Roy 《Journal of the Geological Society of India》2012,80(1):39-47
Heat flow has been determined by combining temperature measurements in 7 boreholes with thermal conductivity measurements in the Upper Vindhyan sedimentary rocks of Shivpuri area, central India. The boreholes are distributed at 5 sites within an area of 15 × 10 km2; their depths range from 174 to 268 m. Geothermal gradients estimated from borehole temperature profiles vary from 8.0–12.7 mK m−1 in the sandstone-rich formations to 25.5–27.5 mK m−1 in the shale-rich formations, consistent with the contrast in thermal conductivities of the two rock types. Heat flow in the area ranges between 45 and 61 mW m−2, with a mean of 52±6 mW m−2. The heat flow values are similar to the >50 mW m−2 heat flow observed in other parts of the northern Indian shield. The heat flow determinations represent the steady-state heat flow because, the thermal transients associated with the initial rifting, convergence and sedimentation in the basin as well as the more recent Deccan volcanism that affected the region to the south of the basin would have decayed, and therefore, the heat flow is in equilibrium with the radiogenic heat production of the crust and the heat flow from the mantle. The present study reports the heat flow measurements from the western part of the Vindhyan basin and provides heat flow information for the Bundhelkhand craton for the first time. Radioelement (Th, U and K) abundances have been measured both in the sedimentary rocks exposed in the area as well as in the underlying basement granite-gneiss of Bundelkhand massif exposed in the adjacent area. Radioactive heat production, estimated from those abundances, indicate mean values of 0.3 μW m−3 for sandstone with inter-bands of shale and siltstone, 0.25 μW m−3 for sandstone with inter-bands siltstone, 0.6 μW m−3 for quartzose sandstone, and 2.7 μW m−3 for the basement granitoids. With a total sedimentary thickness not exceeding a few hundred metres in the area, the heat production of the sedimentary cover would be insignificant. The radioactive heat contribution from the basement granitoids in the upper crust is expected to be large, and together with the heat flow component from the mantle, would control the crustal thermal structure in the region. 相似文献
3.
The total amount of groundwater resources in the middle and upper Odra River basin is 5200×103 m3/d, or about 7.7% of the disposable groundwater resources of Poland. The average modulus of groundwater resources is about
1.4 L/s/km2. Of the 180 'Major Groundwater Basins' (MGWB) in Poland, 43 are partly or totally located within the study area. The MGWB
in southwestern Poland have an average modulus of groundwater resources about 2.28 L/s/km2 and thus have abundant water resources in comparison to MGWB from other parts of the country.
Several types of mineral waters occur in the middle and upper Odra River basin. These waters are concentrated especially in
the Sudety Mountains. Carbon-dioxide waters, with yields of 414 m3/h, are the most widespread of Sudetic mineral waters.
The fresh waters of the crystalline basement have a low mineralization, commonly less than 100 mg/L; they are a HCO3–Ca–Mg or SO4–Ca–Mg type of water. Various hydrochemical compositions characterize the groundwater in sedimentary rocks. The shallow aquifers
are under risk of atmospheric pollution and anthropogenic effects. To prevent the degradation of groundwater resources in
the middle and upper Odra River basin, Critical Protection Areas have been designated within the MGWB.
Received, January 1995 Revised, May 1996, August 1997 Accepted, August 1997 相似文献
4.
Jordi Corominas Ramon Copons José Moya Joan M. Vilaplana Joan Altimir Jordi Amigó 《Landslides》2005,2(4):343-357
Quantitative Risk Assessment (QRA) has become an indispensable tool for the management of landslide hazard and for planning
risk mitigation measures. In this paper we present the evaluation of the rockfall risk at the Solà d’Andorra slope (Andorra
Principality) before and after the implementation of risk mitigation works, in particular, the construction of protective
fences. To calculate the risk level we have (i) identified the potential rockfall release areas, (ii) obtained the volume
distribution of the falling rocks, (iii) determined the frequency of the rockfall events, and (iv) performed trajectographic
analysis with a 3D numerical model (Eurobloc) that has provided both the expected travel distances and the kinetic energy
of the blocks. The risk level at the developed area located at the foot of the rock cliff has been calculated taking into
account the nature of the exposed elements and their vulnerability. In the Forat Negre basin, the most dangerous basin of
the Solà d’Andorra, the construction of two lines of rockfall protection fences has reduced the annual probability of loss
of life for the most exposed person inside the buildings, from 3.8×10−4 to 9.1×10−7 and the societal risk from 1.5×10−2 of annual probability of loss of life to 1.2×10−5. 相似文献
5.
6.
Miriam Kastner 《Geochimica et cosmochimica acta》1974,38(4):650-653
About 5 per cent of all feldspars in sediments are authigenic. This amounts to 0·94 per cent of the total sedimentary mass. At least 2.1 × 1018 kg Na and 3.4 × 1018kg K have been removed from sea water by reconstitution of authigenic feldspars in the total mass of surviving sediments. Consequently, 9.3 × 1019 moles CO2 have been released by the formation of authigenic albite and 8.8 × 1019 moles CO2 by the formation of authigenic K-feldspar. 相似文献
7.
Chemical and Strontium Isotopic Compositions of the Hanjiang Basin Rivers in China: Anthropogenic Impacts and Chemical Weathering 总被引：1，自引：0，他引：1
The Hanjiang River, the largest tributaries of the Changjiang (Yangtze) River, is the water source area of the Middle Route
of China’s South-to-North Water Transfer Project. The chemical and strontium isotopic compositions of the river waters are
determined with the main purpose of understanding the contribution of chemical weathering processes and anthropogenic inputs
on river solutes, as well as the associated CO2 consumption in the carbonate-dominated basin. The major ion compositions of the Hanjiang River waters are characterized by
the dominance of Ca2+ and HCO3
−, followed by Mg2+ and SO4
2−. The increase in TDS and major anions (Cl−, NO3
−, and SO4
2−) concentrations from upstream to downstream is ascribed to both extensive influences from agriculture and domestic activities
over the Hanjiang basin. The chemical and Sr isotopic analyses indicate that three major weathering sources (dolomite, limestone,
and silicates) contribute to the total dissolved loads. The contributions of the different end-members to the dissolved load
are calculated with the mass balance approach. The calculated results show that the dissolved load is dominated by carbonates
weathering, the contribution of which accounts for about 79.4% for the Hanjiang River. The silicate weathering and anthropogenic
contributions are approximately 12.3 and 6.87%, respectively. The total TDS fluxes from chemical weathering calculated for
the water source area (the upper Hanjiang basin) and the whole Hanjiang basin are approximately 3.8 × 106 and 6.1 × 106 ton/year, respectively. The total chemical weathering (carbonate and silicate) rate for the Hanjiang basin is approximately
38.5 ton/km2/year or 18.6 mm/k year, which is higher than global mean values. The fluxes of CO2 consumption by carbonate and silicate weathering are estimated to be 56.4 × 109 and 12.9 × 109 mol/year, respectively. 相似文献
8.
The thermal expansion of gehlenite, Ca2Al[AlSiO7], (up to T=830 K), TbCaAl[Al2O7] (up to T=1100 K) and SmCaAl[Al2O7] (up to T=1024 K) has been determined. All compounds are of the melilite structure type with space group
Thermal expansion data were obtained from in situ X-ray powder diffraction experiments in-house and at HASYLAB at the Deutsches
Elektronen Synchrotron (DESY) in Hamburg (Germany). The thermal expansion coefficients for gehlenite were found to be: α1=7.2(4)×10−6×K−1+3.6(7)×10−9ΔT×K−2 and α3=15.0(1)×10−6×K−1. For TbCaAl[Al2O7] the respective values are: α1=7.0(2)×10−6×K−1+2.0(2)×10−9ΔT×K−2 and α3=8.5(2)×10−6×K−1+2.0(3)×10−9ΔT×K−2, and the thermal expansion coefficients for SmCaAl[Al2O7] are: α1=6.9(2)×10−6×K−1+1.7(2)×10−9ΔT×K−2 and α3=9.344(5)×10−6×K−1. The expansion mechanisms of the three compounds are explained in terms of structural trends obtained from Rietveld refinements
of the crystal structures of the compounds against the powder diffraction patterns. No structural phase transitions have been
observed. While gehlenite behaves like a ‘proper’ layer structure, the aluminates show increased framework structure behavior.
This is most probably explained by stronger coulombic interactions between the tetrahedral conformation and the layer-bridging
cations due to the coupled substitution (Ca2++Si4+)–(Ln
3++Al3+) in the melilite-type structure.
This article has been mistakenly published twice. The first and original version of it is available at . 相似文献
9.
Yongping Shen 《GeoJournal》1991,25(2-3):249-254
On September 16th, 1986, an ice avalanche from a hanging glacier near the K2 peak at 7800 m asl, Karakorum, triggered a massive
avalanche of ice and snow. Ice and snow, impacting on the path, formed a dust cloud at the advancing tip. Grounding on the
firn basin surface, ice and snow broke into fine powder and covered the whole basin. Fine powder of the dust cloud rose up
to 500–600 m and drifted 4–5 km away. On the basis of field observations and measurements, topography and weather, conditions
of the avalanche formation are analyzed. Judging by the data obtained, the avalanche was extremely large, its vertical descend
being 2500 m, the maximum motion speed 124 m/s, volume of the avalanche mass 2 × 105 m3 to 107 m3, and impact pressure, as the avalanche grounded, 2.3 × 106 Pa. It could have been one of the largest avalanches ever recorded, causing danger for mountaineering and expedition activities
in this area. 相似文献
10.
伦坡拉盆地是西藏地区唯一取得工业油流的含油气盆地,由于地质条件复杂,油质偏稠,导致油气勘探进展缓慢。为了明确盆地油气资源潜力,有效指导下一步勘探方向,文章结合新钻探及地震资料,运用盆地模拟方法开展埋藏史、热史及生烃史研究,计算了盆地古近系生烃量和资源量。结果表明伦坡拉盆地古近系生烃量为49.80×108 t,资源量为1.507×108 t。其中以蒋日阿错为最大生烃中心,生烃量20.93×108 t,资源量1.05×108 t,江加错和爬错北部为次重要生烃中心,生烃量分别为8.83×108 t和14.76×108 t,资源量分别为0.41×108 t及0.71×108 t。从模拟结果可知,蒋日阿错洼陷、江加错洼陷资源丰度相对较高,为油气资源富集有利区,爬错洼陷由于烃源和圈闭条件较差,目前仅发现罗玛迪库构造圈闭,资源丰度较低。应用盆地模拟明确了伦坡拉盆地油气资源构成和油气资源分布有利区带,为下一步勘探指明了方向。 相似文献
11.
The aquifer system in the Thon Buri sedimentary basin below the deltaic flood plain of the Chao Phraya River, central Thailand, has been exploited for public water supply for the capital Bangkok since the early 1920s. Groundwater withdrawal, currently 1.4 million m3/d, has resulted in a maximum decline in hydraulic head of up to 40 m. This has induced land subsidence of as much as 1.7 m (1940–1992) in the eastern suburbs of the metropolis. Artificial injection of purified water within an area-wide network of recharge wells could constitute a remedy to slow the water level depression within the sedimentary basin, and thus the subsidence. This requires a prior shutdown of water withdrawal. The flow paths of the injected water can be traced by changes in the 87Sr/86Sr ratio of the groundwater and injected water mixture within the three main aquifers in the basin that are used for public supply. The ratios, monitored at five monitoring stations within the cone of depression, have been constant over 3 years. Injection of the calculated cone volume of 5.2?×?109 m3 would take at least 10 years, depending on the injection pressure and the number and position of wells. 相似文献
12.
A comparative study of aquifer systems occurring at the Paraná sedimentary basin, Brazil: U-isotopes contribution 总被引：1，自引：1，他引：0
D. M. Bonotto 《Environmental Earth Sciences》2013,68(5):1405-1418
The radioactivity due to 238U and 234U in three aquifer systems occurring within the Paraná sedimentary basin, South America, has been investigated. Uranium is much less dissolved from fractured igneous rocks than from the porous sedimentary rocks as indicated by the U-mobility coefficients between 7.6 × 10?6 and 1.2 × 10?3 g cm?3. These values are also compatible with the U preference ratios relative to Na, K, Ca, Mg and SiO2, which showed that U is never preferentially mobilized in the liquid phase during the flow occurring in cracks, fissures, fractures and faults of the igneous basaltic rocks. Experimental dissolution of diabase grains on a time-scale laboratory has demonstrated that the U dissolution appeared to be a two-stage process characterized by linear and second-order kinetics. The U dissolution rate was 8 × 10?16 mol m?2 s?1 that is within the range of 4 × 10?16–3 × 10?14 mol m?2 s?1 estimated for other rock types. The 234U/238U activity ratio of dissolved U in solutions was higher than unity, a typical result expected during the water–rock interactions when preferential 234U-leach from the rock surfaces takes place. Some U-isotopes data allowed estimating 320 ka for the groundwater residence time in a sector of a transect in São Paulo State. A modeling has been also realized considering all U-isotopes data obtained in Bauru (35 samples), Serra Geral (16 samples) and Guarani (29 samples) aquifers. The results indicated that the Bauru aquifer waters may result from the admixture of waters from Guarani (1.5 %) and Serra Geral (98.5 %) aquifers. 相似文献
13.
Estimation of methane emission from whole waste landfill site using correlation between flux and ground temperature 总被引：1，自引：0，他引：1
Tomonori Ishigaki Masato Yamada Masanao Nagamori Yusaku Ono Yuzo Inoue 《Environmental Geology》2005,48(7):845-853
A methodology to estimate a methane emission in a waste landfill site was developed. The methane flux at a waste landfill
site in summer, autumn, and winter was within the following ranges: from −1.3×10−2 to 16, from −6.4×10−2 to 7.5, and from −1.6×10−3 to 1.5×10−2 g-CH4 m−2 h−1, respectively. In those seasons, the mean methane emission rate and coefficient of variation were 1.1 g-CH4 m−2 h−1 ±290%, 0.57 g-CH4 m−2 h−1 ±347%, and 5.4×10−2 g-CH4 m−2 h−1 ±370%, respectively. These results simultaneously showed that fluctuations of methane emission from the landfill surface
were both of spatial and temporal variability. In each season, an exponential relationship was observed between the methane
flux density and the ground temperature. Total methane emissions were estimated to be 5.7×10−2, 7.1×10−3, and 1.7×10−3 g-CH4 m−2 h−1 in the summer, autumn, and winter surveys, respectively, using a temperature surrogated-kriging method. The results of this
study would improve upon the labor-intensive closed-chamber method, and could be a more practical way to estimate methane
emissions from waste landfills. 相似文献
14.
Long Lake, located near Lake Michigan within the dune-complexes of Indiana Dunes National Lakeshore, USA, was formed some
time during the Pleistocene and Holocene epochs. A surficial aquifer underlies Long Lake, which is either a source or sink
for the later. The hydrologic processes in the lakeshore and surrounding environs have been significantly altered during the
agricultural, municipal, and industrial development of the region. Limited data suggest that the organisms of Long Lake have
elevated levels of several contaminants. This study attempts to quantify seepage within the lake to assess the potential threat
to groundwater quality. Seepage measurements and minipiezometric tests were used to determine seepage within the lake. Seepage
measurements and minipiezometric tests suggest that water seeps out of Long Lake, thus recharging the groundwater that flows
southwest away from the lake. There is a great deal of variability in the seepage rate, with a mean of 11.5×10–4±11.2×10–4 m d–1. The mean seepage rate of 0.3 m yr–1 for Long Lake is greater than the 0.2 m yr–1 recharge rate estimated for the drainage basin area. The Long Lake recharge volume of 2.5×105 m3 yr–1 is approximately 22% of the volume of the lake and is significant when compared to the total surface recharge volume of 4.8×105 m3 yr–1 to the upper aquifer of the drainage area. There is a potential for contamination of the groundwater system through seepage
from the lake from contaminants derived from aerial depositions.
Received: 16 August 1995 · Accepted: 18 September 1995 相似文献
15.
This paper determined the fixed-ammonium (NH4
+) contents of lamprophyres in the Zhenyuan gold orefield, Yunnan Province, China. The results show that the NH4
+ contents of minettes in the orefield range from 120 × 10−6 to 469 × 10−6 and those of kersantites from 74.3 × 10−6 to 136 × 10−6. These values are higher than those of other mantle-derived rocks (less than 50 × 10−6), but lower than those of carbonaceous wall rocks in the orefield (from 1200 × 10−6 to 1343 × 10−6). Combining with the Sr isotopic composition, this paper suggested that lamprophyres in the orefield with high NH4
+ contents relative to other mantle-derived rocks would not have resulted from the primary magma contaminated by crustal materials
in the process of rising or in the magma chamber, but from mantel metasomatism.
This research project was financially supported jointly by the State Key Basic Research Program of the People’s Republic of
China (No. G1999043203) and the Chinese Academy of Sciences Knowledge-Innovation Program (No. KZCX3-SW-125). 相似文献
16.
利用井温分布估算莺-琼盆地地下流体运移速度 总被引：5，自引：1，他引：4
莺-琼盆地是典型的高温高压盆地,现今平均地表热流78.7mW/m2,产生地表高热流的主要原因是深部热流体活动。根据盆地地温场分布特征与地下流体活动规律的关系,利用井温资料,我们计算了典型钻孔LD30-1-1A井地下流体的流速分布。结果表明,LD-30-1-1A井地下流体可分为上、中、下三段。上段流体运动微弱,垂向流速仅为8.33×10-12 cm/s;中段流体向下垂向流速为4.37×10-8 cm/s;下段流体向上垂向流速为2.65×10-8 cm/s. 相似文献
17.
The thermal expansion of gehlenite, Ca2Al[AlSiO7], (up to T=830 K), TbCaAl[Al2O7] (up to T=1,100 K) and SmCaAl[Al2O7] (up to T=1,024 K) has been determined. All compounds are of the melilite structure type with space group
Thermal expansion data was obtained from in situ X-ray powder diffraction experiments in-house and at HASYLAB at the Deutsches Elektronen Synchrotron (DESY) in Hamburg (Germany). The thermal expansion coefficients for gehlenite were found to be: α1=7.2(4)×10−6 K−1+3.6(7)×10−9ΔT K−2 and α3=15.0(1)×10−6 K−1. For TbCaAl[Al2O7] the respective values are: α1=7.0(2)×10−6 K−1+2.0(2)×10−9ΔT K−2 and α3=8.5(2)×10−6 K−1+2.0(3)×10−9ΔT K−2, and the thermal expansion coefficients for SmCaAl[Al2O7] are: α1=6.9(2)× 10−6 K−1+1.7(2)×10−9ΔT K−2 and α3=9.344(5)×10−6 K−1. The expansion-mechanisms of the three compounds are explained in terms of structural trends obtained from Rietveld refinements
of the crystal structures of the compounds against the powder diffraction patterns. No structural phase transitions have been
observed. While gehlenite behaves like a ’proper’ layer structure, the aluminates show increased framework structure behaviour.
This is most probably explained by stronger coulombic interactions between the tetrahedral conformation and the layer-bridging
cations due to the coupled substitution (Ca2++Si4+)-(Ln
3++Al3+) in the melilite-type structure.
Electronic Supplementary Material Supplementary material is available for this article at 相似文献
18.
尚义葛令夭高铬花岗岩(Closepet-like)——新太古代古缝合带的新证据 总被引：2，自引：1，他引：1
在华北克拉通北部,太古代麻粒岩古陆核与陆外沉积盆地(红旗营子群)之间已经厘定出一个晚太古代的古洋壳残片(Wang et al., 2009)。此残片南北两侧又发现了低Al2O3 型TTG岩体(2512±19Ma)、富钾高铬的深熔花岗岩(Closepet-like),含Cr 97×10-6~308×10-6,以及含大量密集的煌斑岩脉的含石英的二长岩(Sanukitoid-like)等三类在成因上与俯冲带密切相关的岩体。低Al2O3型TTG是在角闪麻粒岩亚相条件下由俯冲中的滑片部分熔融所生成。深熔花岗岩是TTG再熔融的产物,而它们的基性化演化和Cr的增高是幔源岩浆与富钾深熔花岗岩经复杂的岩浆混合和交代改造的结果。 相似文献
19.
四川海相克拉通盆地显生宙演化阶段及其特征 总被引：2，自引：1，他引：1
四川叠合盆地是在四川海相克拉通盆地基础上形成的。本文利用最新的钻井资料、地震资料及其研究成果,详细阐述了四川海相克拉通盆地在显生宙的演化阶段及其特征。研究结果发现,四川海相克拉通盆地显生宙演化可分为早晚两期,早期为晚震旦世-石炭纪,晚期为二叠纪-中三叠世。两期克拉通演化都经历了早期弱拉张,后期弱挤压阶段。弱拉张初始阶段都有一次海相碳酸盐岩的大面积稳定沉积(震旦系灯影组和二叠系栖霞-茅口组)和随后的隆升剥蚀作用及风化壳岩溶作用。其后进入弱拉张期,发育拉张槽,拉张强度最大的部位均位于克拉通的西北部,都是从克拉通的西北部边缘向克拉通内部减弱。然而,两期拉张槽的充填特征不同,早寒武世绵阳-长宁拉张槽是补偿型充填,与拉张槽周缘相比,拉张槽内沉积厚度巨大;晚二叠世-早三叠世开江-梁平拉张槽为欠补偿型充填,与拉张槽周缘相比,拉张槽内沉积厚度非常薄。拉张期结束后进入弱挤压阶段,形成古隆起,挤压强度最大的部位均位于克拉通的西南部,都是从克拉通的西南边缘向克拉通内部减弱。弱拉张阶段的拉张槽与弱挤压阶段的古隆起均为大角度相交关系;然而,拉张槽和古隆起的规模差别较大,早寒武世绵阳-长宁拉张槽面积约5.4×10~4km~2,对应的加里东期乐山-龙女寺古隆起面积6×10~4km~2;晚二叠世-早三叠世开江-梁平拉张槽面积约2.0×10~4km~2,对应的印支期开江古隆起面积0.8×10~4km~2;晚二叠世-早三叠世蓬溪-武胜拉张槽面积约1.5×10~4km~2,对应的印支期泸州古隆起面积4.2×10~4km~2。绵阳-长宁拉张槽的规模比开江-梁平拉张槽、蓬溪-武胜拉张槽要大,乐山-龙女寺古隆起的规模也大于泸州-开江古隆起的规模。四川海相克拉通盆地显生宙演化特征在很大程度上控制了四川叠合盆地海相油气地质条件的发育和油气藏的形成分布。 相似文献
20.
内蒙古乌兰沟埃达克岩锆石U-Pb年龄及构造环境 总被引：2，自引：1，他引：1
内蒙古中部贺根山缝合带的梅劳特乌拉蛇绿岩中,新发现乌兰沟埃达克岩,岩性为花岗闪长岩。LA-ICP-MS锆石UPb测年结果表明,乌兰沟埃达克岩的侵位年龄为279.3±1.4Ma,其形成时代为早二叠世。乌兰沟埃达克岩SiO_2含量为65.92%~69.65%,MgO为1.34%~2.16%,Al_2O_3为15.30%~17.33%,Na_2O/K_2O值为3.95~14.09,Sr=359.60×10~(-6)~734.00×10~(-6),Yb=0.83×10~(-6)~2.02×10~(-6),Y=6.65×10~(-6)~12.84×10~(-6);富集K、Rb、Sr等大离子亲石元素,亏损Nb、Ta、Ti、P等高场强元素;稀土元素总量为32.18×10~(-6)~65.41×10~(-6),明显较低,轻、重稀土元素分馏明显,(La/Yb)N值为2.84~7.56,无明显Eu异常,显示出高硅埃达克岩(HSA)的地球化学特征。该埃达克岩具有岛弧型岩浆岩特征,形成于俯冲带岛弧环境,可能为洋内俯冲洋壳+俯冲深积物部分熔融并与上覆地幔楔橄榄岩反应成因。根据乌兰沟埃达克岩与梅劳特乌拉蛇绿岩的时空分布与演化特征,贺根山缝合带在早二叠世可能存在洋内俯冲作用。 相似文献