Granite is the most widely known igneous rock. It is an intrusive rock with visible grains of feldspar, quartz, mica, and amphibole minerals. It is durable and widely used in …
The locations of granites discussed in this study are shown in Fig. 1.The full database contains 24,555 granites for which heat production can be estimated, 54% of the samples (13,400) are reported with an age resolution/bound of less than ± 200 Ma (Supplemental Fig. 1).The vast majority of the data (> 80%) have a reported uncertainty …
However, the situation changed for the remaining rocks: two-mica granites, B1 and B2, showed higher values, respectively 21 and 29 Bq kg −1. In the samples from the porphyritic biotite granites, the C3 group also reversed the earlier trend, as it had the highest average of the set (22 Bq kg −1 and a median of 18 Bq kg −1). In all of the ...
Here, five representative granite bodies in question are briefly introduced as follow (Figures 1 and 2). Fogang granite body of Southern granite belt cover a total area of 6000 km2, it is a compound granite body with main magma emplacement timing at ca. 162 Ma (Figure 2). More than 90% Fogang rock body is hornblende-bearing granite with minor A ...
In recent years, with the discovery of large granite reservoirs in Vietnam, Libya, Venezuela, Chad and China's Bohai Bay, Junggar and Qaidam Basins, etc., it has received more and more attention and focus in the oil geology community (Hou et al. 2019; Ye et al. 2020a, b).In 2019, CNOOC made a breakthrough in the exploration of YL area, …
Semantic Scholar extracted view of "Introduction to the origin of granites and related rocks" by Yong‐Fei Zheng et al. ... The production of granitic magmas through crustal anatexis at convergent plate boundaries. Yong‐Fei Zheng Peng Gao. Geology. 2021; 78. Save.
The whole-rock Sr-Nd isotopes in the granitoids are quite similar to those of Late Cretaceous mafic rocks in the Gangdese batholith. In addition, both synmagmatic zircons and relict zircons with Late Cretaceous U-Pb ages exhibit almost the same Hf-O isotope compositions to those of the slightly earlier mafic rocks.
There are two major source regions for producing molten granite: igneous and sedimentary protoliths (source rocks).
Present-day heat production in granitic rocks as function of their emplacement age based on the GRANITE2017 database. Horizontal size of colored boxes-time span; vertical size-mean value ± 1σ.
A net mantle adiabat of 0.35 °C/km was added to the calculated temperatures as a posterior. Radiogenic heat production from tholeiitic basalt, granite (half value), and peridotite was assigned to ...
Weathering process leads to changes in mineral composition, microdefects and mechanical properties of mineral grains, which has a significant impact on the macroscale mechanical properties of granitic rocks. In this paper, four granitic samples with different weathering degrees were investigated using microscale rock mechanics …
These reactions produce 20–70 vol%, melt according to protolith composition, at temperatures up to 1000 °C. Calculated phase diagrams for pelite are used to illustrate …
Southeastern China contains the most abundant granite distribution in the country and accounts for more than 40% of the total granite area. This paper analyzes the rock radiogenic heat production ...
Granite (sensu stricto) is a coarse-grained intrusive rock in which quartz is 20-60% QAP content by volume and alkali feldspar accounts for 35% to 90% of the total feldspar. It doesn't have …
The results show that the radiogenic heat production of the granitic rocks is approximately that of global Mesozoic-Cenozoic granites, which is further corroborated by an extensive compilation of ...
Partial melting of crustal rocks produces granitic magmas with varying compositions. • Both ancient and juvenile crust underwent partial melting to produce granitic magmas. • Active rifting is a geodynamic mechanism of crustal anatexis in fossil suture zone. • Rifting orogeny is realized by domical uplift of granites and metamorphic core ...
Enhanced or Engineered Geothermal Systems (EGS) have been recognized by geothermal energy experts as being the necessary technology for substantially increasing the contribution of geothermal energy to the world's production of electricity. As one of the largest energy consumption countries, China has started a China Geological Survey …
Granitic Rocks. Here we discuss a group of plutonic igneous rocks usually referred to as "granitic rocks", "granitoids", or loosely as granites. Included are true granites, but our discussion will include all medium to coarse-grained rocks that are mostly felsic with a few mafic minerals. Classification
To determine the relationship between the age of a granitic rock and its RHP, 260 granites were selected from the Granites-2019 database for whole rock analysis and dating (Fig. 8). The relationship between current RHP and absolute age of the granite can be expressed as (4) RHP = −0.266 ln (age) + 4.1102 where the age is in million years (Ma).
The Earth's granite crust evolved over time from rocks produced from the direct melting of eclogite, through to ones produced in the mantle wedge, and finally to …
The formation of granites by subduction. In a, subducting oceanic crust releases saline fluids from the dehydration of the crust, and at greater depth the underlying lithosphere.b – these fluids partially melt the overlying hot asthenosphere, making basaltic magmas enriched in sodium and potassium.These rise to the base of the crust, c, where …
a–d, Compositional variation in MgO, Cr, Ni and Sr against SiO 2 for TTG and hornblende-bearing rocks of the high-MgO granite series. The blue field in each panel is a kernel density field ...
where concentrations are given in weight-ppm (i.e., 10 −6 kg kg −1) for uranium and thorium and in weight-% for potassium.. The natural γ-radiation of rocks can be measured, for instance, by spectrometry on rock samples in the laboratory (see Measuring Techniques).An alternative source of γ-spectra is the natural gamma …
Granite is an igneous rock that forms from the slow crystallization of magma beneath the Earth's surface. The formation of granite typically involves three main stages: 1. Melting: Granite forms from the melting of pre-existing rocks, such as sedimentary or metamorphic rocks, that are …
9th Hutton Symposium on the Origin of Granites and Related Rocks. Edited by . Yong-Fei Zheng; Calvin F. Miller; Xi-Sheng Xu; Jean-François Moyen; Xiao-Lei Wang; Volumes 402–403, 15 November 2021. Download full issue. ... The production of granitic magmas through crustal anatexis at convergent plate boundaries. Yong-Fei Zheng, Peng Gao ...
The radioactive heat production of rocks (HP in μWm −3) was deduced using the relations given by Cermak et al. and Rybach in Eq. of the form ... Abbady AGE, Al-Ghamdi(2018) Heat production rate from radioactive elements of granite rocks in north and southeastern Arabian shield Kingdom of Saudi Arabia. J Radiat Res Appl Sci …
Papers in this volume report progresses in mineralogical, petrological, geochronological and geochemical studies of granites and related rocks, with tectonic …
Granite formed by two different processes: by fractional crystallization of basaltic magma; and by melting older continental crust. Between these end members, there is a spectrum of hybrid processes, including mixing …
granitization, formation of granite or closely related rocks by metamorphic processes, as opposed to igneous processes in which such rocks form from a melt, or magma, of …
The analysis of the relationship between heat production in the granitic rocks and the tectonic environment where the granitic rocks were formed shows that the age of granites is more important than the granite-type in controlling …
