The Rb/Sr-Ba diagram shows the fields of anatectic granite-gneisses, biotite granites, lamprophyres, graphitized crystalline schists, black shales, skarns, and quartz-graphite metasomatic rocks. The C isotopic composition in graphite from the metaigneous rocks (lamprophyres and crystalline schists ...
The granite porphyry contains 71.1%~74.4% of SiO2, high total alkalis (K2O+Na2O=8.4%~9.4%), high K and high A/CNK of 1.06~1.21, and is characterized by enrichment of light rare earth elements with negative europium anomalies (δEu=0.53~0.74), relative enrichment of large ion lithophile ...
The latter, however, differ in the depth of anomalies of some elements. Obtained geological, petrographic, and geochemical data suggest a magmatic genesis of the rocks of different composition and their derivation from a single magma during its differentiation. On the basis of all characteristics, ...
Igneous zircon: trace element composition as an indicator of source rock type Contrib. Mineral. Petrol., 143 (5) (2002), pp. 602-622 Google Scholar Blevin, 2004 P.L. Blevin Redox and compositional parameters for interpreting the granitoid metallogeny of eastern Australia: implications for gold-...
Model analysis reveals that the trace element composition of the black gouge is consistent with high-temperature (up to 250°C) coseismic fluid-rock interactions. Thermal and kinetic constraints indicate that there have been repeated slips on the fault at moderate depths (e.g., 600 m), ...
Table 2. Trace element composition of Paleoproterozoic intrusions in Bengbu uplift(10-6) | Show Table DownLoad: CSV 图6. 蚌埠隆起带古元古代侵入体球粒陨石标准化稀土元素配分图(a)及原始地幔标准化微量元素蛛网图(b)(标准化数值据Sun and McDonough, 1989) Figure 6. Chondrite-normalized REE patte...
The data also show an interbody and an intrabody chemical variability due to the variation in the composition of the crustal magma protoliths, as assigned by K/Rb relations. The presence of several magmatic cycles which built up the major intrusions reflects a magma ascent from collecting ...
The maceral composition of the OM can also help to determine kerogen types (Clarke, 1920). Alginate and amorphous organic matter from lacustrine or marine mudstone, only range less than 2% of the total kerogen composition of the samples (Fig. 5a). Inertinite and vitrinite, originating from th...
With consideration of the origin of granite, we have concluded our review of the processes involved in the origin and transformation of rocks in the earth’s crust. Thus, we have observed a cycle of processes starting with magmatic crystallization, leading to weathering, sedimentation, and finally...
Geochemical and Nd-Sr-Pb isotopic composition of Mesozoic volcanic rocks in the Songliao basin, NE China[J]. Geochemical Journal, 2006, 40:149-159. doi: 10.2343/geochemj.40.149 CrossRef Google Scholar [40] 张玉涛, 张连昌, 英基丰, 等.大兴安岭北段塔河地区早白垩世火山岩地球化学及源区...