"gabbro"相关例句(16)
1.ARCHAEAN GABBRO INTRUSION IN JINCHANGYU-WANGCHANG AREA, EASTERN HEBEI, CHINA
2.another is that of metamorphic peridotite +pyroxenite+gabbro (abbreviated to PPG series).
3.igneous rock that has solidified beneath the earth's surface; granite or diorite or gabbro.
4.STRUCTURAL MATERIAL PECULIARITIES AND EVOLUTION OF GABBRO ANORTHOSITE COMPLEXES OF THE ALDEN MASSIF, SOUTH RUSSIA
5.LA-ICPMS Zircon U-Pb Dating of Gabbro from the Bayingou Ophiolite in the Northern Tianshan Mountains
6.The Kalarsky massif is a constituent part of the extensive Djugdjur Kalarsky gabbro anorthosite belt, confined to the southern periphery of the Aldan massif.
7.On the basis of the single factor dry rodded test of coarse aggregate, the optimal framework structure of gabbro Sup-16 gradation is given out.
8.These deposits were, when being formed, controlled by volcanic structures (volcanic dome and volcanic breccia pipe), fault structures (NE and NW trending), gabbro porphyrite body and “depression in depression”.
9.Clinopyroxene, labrador, omphacite, garnet and enstatite as the main minerals in ultramafic rock, eclogite and gabbro are selected as the samples to study the variations of resistivity of the mantle materials with pressures between 3GPa and 20GPa using a DAC device.
10.Guided by theory and method of unit-superunit mapping in the granite area, study the lithology, lithochemistry, trace elements, and rare earth elements, er. of the Wuzengsu gabbro body, and subdivide the body into four units.
11.U-Pb dating of 30 zircons from Queshan, Huashan, and Yaoshan gabbros and of 11 zircons from Kuangshan gabbro was made on LA-ICP-MS. The results show that the data of 30 zircons cluster around the concordia of 124～142 Ma, yielding a weighted mean (~(206)Pb)/~(238)U age of 130.8±1.5 Ma, and that the data of 11 zircons yield a weighted mean ()~(206)Pb/~(238)U age of 127±2 Ma, which implies that the crystallization of the Jinan gabbro occurred in Early Cretaceous.
12.The morphological features of zircons from gabbro and adamellite indicate that the zircon crystallization temperatures of these two rocks are 850～900℃ and 600～850℃, respectively, which implies the formation depth of the complex.
13.There was an intense volcanic activity in the rift basin of Tarim Basin in Early Permian. It consisted of eruption of basalt as well as medium-acidic tuff and massive intrusion of basic dike. The K_Ar isotopic age of the basalt is 241～278 Ma, and the Sm_Nd isotopic age of the gabbro is 259 Ma.
14.The REE and trace element distribution patterns of Tayuan meta-gabbro show enrichment of LREE and incompatible elements, whic h is similar to the character of basalt in Azores platform as the modern E-typ e of enriched mantle. The deficiency of Nb and Ta, however,suggests its island- arc background.
15.Baddeleyite and zircon from medium- and coarse-grained hornblende-biotite gabbro yielded SHRIMP and TIMS U-Pb ages of 501.4±1.2 Ma and 480.0±3.4 Ma respectively. The age difference between the two minerals is about 20 Ma. The transformation of some baddeleyite to zircon in the rock and zircon genesis were studied.
16.Based on an analysis of geochemical characteristics of rocks and trace elements as well as rare earth elements, this paper holds that they are products of crystallization differentiation of the same magma, that the major ore resource of this area is copper, and that gabbro-diabase is the main ore-bearing horizon.
