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101.
ABSTRACT We present the major and trace elements and Sr, Nd, and Pb isotopes in mid-ocean ridge basalts (MORB) from the East Pacific Rise (EPR) at 2.6–3.1°S. These samples are low-K tholeiites and show significant variation in their major element compositions (e.g. 4.60–8.18 wt% MgO, 8.34–12.12 wt% CaO, 9.78–14.25 wt% Fe2O3, and 0.06–0.34 K2O wt%). Trace element abundances of the 2.6–3.1°S MORB are variably depleted (e.g. (La/Sm), N = 0.51–0.78, Zr/Y = 2.35–3.42, Th/La = 0.035–0.056, and Ce/Yb = 2.38–3.96) but closely resemble the average N-MORB. In the compatible elements (Ni and Cr) against incompatible element Zr plots, the 2.6–3.1°S MORB show well-defined negative correlations, together with a liquid line of descent (LLD) modelling and petrographic observations, implying a significant role of olivine, plagioclase and clinopyroxene fractionation during magma evolution. When compared to global MORB and peridotites, the 2.6–3.1°S MORB and most of the other axial lavas from the South EPR show similar Zn/Fe, Zn/Mn, and Fe/Mn ratios, attesting to a peridotite-dominated mantle lithology. However, the relationships between incompatible trace element ratios, such as Zr/Rb and Nb/Sm, and the negative correlation between Zr/Nb and 87Sr/86Sr indicate a geochemically heterogeneous mantle source. The mantle beneath the South EPR likely consists of two components, with the enriched component residing as physically distinct domains (e.g. veins or dikes) in the depleted peridotite matrix. In the Sr–Nd–Pb isotope space, the South EPR MORB lie along the mixing lines between the depleted MORB mantle (DMM) and the ‘C’-like Pukapuka endmember. We infer that low-F melts derived from these enriched materials may cause localized mantle heterogeneity (veins or dikes) via an infiltration process. Subsequent melting of the refertilized mantle may impart an isotopically distinct characteristic to South EPR MORB. 相似文献
102.
粉石英在蓄电池胶壳中的应用 总被引:3,自引:0,他引:3
本文着重介绍了粉石英的工艺矿物特性以及其在蓄电池胶壳中的应用效果,证明了粉石英用作蓄电池胶壳的填料,能够改善混炼工艺、提高产品质量、增加填充量、降低生产成本,是一种理想的橡胶填料。 相似文献
103.
为快速准确建立相应数据库,编制了数据库管理软件。通过对四川石棉地震重点监视区地下水网点水位和气压40余万组数据的处理实践,效果很好,并已在有关单位推广应用。 相似文献
104.
105.
软岩的强度—变形—时间之间关系的试验分析 总被引:6,自引:4,他引:2
对软岩和有不连续面的软岩试样进行一系列固结不排水三轴压缩和蠕变试验,测定并分析了它们在正常固结和超固结状态下的应变软化性状、蠕变特性和残余强度的变化规律。探讨了软岩中存在的不连续面对应力-应变关系、残余强度特性和蠕变应变速率的影响。 相似文献
106.
Estimation of groundwater recharge using the chloride mass-balance method, Pingtung Plain, Taiwan 总被引:4,自引:0,他引:4
Due to rapid economic growth in the Pingtung Plain of Taiwan, the use of groundwater resources has changed dramatically.
Over-pumping of the groundwater reservoir, which lowers hydraulic heads in the aquifers, is not only affecting the coastal
area negatively but has serious consequences for agriculture throughout the plain. In order to determine the safe yield of
the aquifer underlying the plain, a reliable estimate of groundwater recharge is desirable. In the present study, for the
first time, the chloride mass-balance method is adopted to estimate groundwater recharge in the plain. Four sites in the central
part were chosen to facilitate the estimations using the ion-chromatograph and Thiessen polygon-weighting methods. Based on
the measured and calculated results, in all sites, including the mountain and river boundaries, recharge to the groundwater
is probably 15% of the annual rainfall, excluding recharge from additional irrigation water. This information can improve
the accuracy of future groundwater-simulation and management models in the plain.
Received, April 1996 Revised, March 1997, November 1997 Accepted, March 1998 相似文献
107.
翡翠的成因及宝石学意义刍论 总被引:1,自引:0,他引:1
从地质学角度出发,对翡翠的成因作了初步研究。以此研究结果为基础,探讨了翡翠的矿床类型,翡翠矿床的找矿方向及翡翠“B”货的科学鉴定。 相似文献
108.
依据原种金花茶的生态特性及引种试验结果,通过分析南宁市的气候条件得出,南宁市适宜种植金花茶的结论 相似文献
109.
引起全球海平面变化的因素是复杂多样的,大气压、风、大洋环流以及海水密度的变化,都会引起海平面在时间、空间上的变化,而海水温度的变化是海平面变化的主要原因。该文利用法国Archiving, Validation and Interpretation of Satellite Oceanographic data(AVISO)的海表面高度异常数据,计算了1992年10月至2007年1月间,全球海平面的平均上升速度,同时详细解算海平面上升速度的全球空间分布,分析全球海平面的变化趋势并将海平面变化同美国国家海洋大气署(NOAA)的Optimum Interpolation Sea Surface Temperature (OISST)海表面温度数据进行了比对和相关分析。 相似文献
110.
Sharmishtha Dattagupta Jonathan Martin Shu-min Liao Robert S. Carney & Charles R. Fisher 《Marine Ecology》2007,28(1):193-198
Bathynerita naticoidea (Gastropoda: Neritidae) is a numerically dominant heterotrophic gastropod found at hydrocarbon seep sites on the upper Louisiana slope of the Gulf of Mexico. Snails of this species are commonly associated with beds of the methanotrophic mussel Bathymodiolus childressi (Bivalvia: Mytilidae), and their population structure mirrors that of the mussels they are found among. Previous studies have shown that these snails feed on bacteria and decomposing periostracum on the B. childressi shell. We predicted that B. naticoidea might be attracted to cues specific to its preferred habitat, such as dissolved methane, mucus from conspecific snails, or metabolites produced by B. childressi mussels. To examine this, we used a flow‐through Y‐maze system to investigate the behavior of B. naticoidea exposed to these potential cues. We found that the nerite is not attracted to methane, but is strongly attracted to seawater conditioned with B. childressi. The attractant appears to be specific to this type of mussel, and is not a soluble cue produced by conspecific snails. 相似文献