The Geshere syenite-peralkaline granite pluton: a key to …
The syenite is hypersolvus and contains a ferro-richteritic amphibole as the dominant femic mineral, whereas the most evolved granite is subsolvus and contains annite as the dominant femic mineral. ... ABSTRACT The Dutsen Wai and Ropp complexes are parts of the over 50 within-plate alkaline ring complexes in north-central Nigeria. These ...
Middle to Late Permian adakitic granites in the Xiari complex, North …
— The northern margin of the North China Craton (NCC) is characterized by widespread Late Paleozoic granites (Fig. 1), which contain significant information about tectonic evolution of North China and have attracted the attention of geologists for decades.Previous studies indicated that Middle to Late Permian A-type granites and …
S-type granites and their probable absence in southwestern …
Peraluminous granites of various ages in southwestern North America are distinctly different. They rarely contain cordierite (a mineral characteristic of LFB S-types), but …
(PDF) Tantalum-(niobium-tin) mineralisation in pegmatites …
— minerals that are present as minor constituents in rare-metal granites (RMG) and granitic rare-element pegmatites (REP). Significant potential exists as a by-product …
Mineral isotope evidence for the contemporaneous process …
— The North Dabie zone is bounded by the Xiaotian–Mozitan Fault to the north, the Tan-Lu fault to the east, and the Wuhe–Shuihou shear zone to the south (Fig. 1).About 50% of the area is made up of granitic plutons, which intruded into amphibolite-facies to granulite-facies orthogneisses (including migmatite) with minor metabasites (eclogite …
Petrogenesis of high-maficity S-type granites: Insight from …
— In this paper, we present new zircon U-Pb dating and Hf isotopic analytical results as well as whole-rock geochemical data of the early Paleozoic Jinxi granites in …
Granite
Granite is the most widespread of igneous rocks, underlying much of the continental crust. Granite is an intrusive igneous rock. Intrusive rocks form. ... Granites usually have a coarse texture (individual minerals are visible without magnification), because the magma cools slowly underground, allowing larger crystal growth.
High and low temperature alteration of uranium and thorium minerals…
— The Um Ara area, in the south Eastern Desert of Egypt contains a number of uranium occurrences related to granitic rocks. U-rich thorite, thorite and zircon are the main primary uranium- and thorium-bearing minerals found in mineralized zones of the Um Ara alkali-feldspar granites; uranophane is the most common secondary uranium mineral. U …
NEOPROTEROZOIC S-TYPE GRANITES IN THE ALXA …
South China during the Neoproterozoic, and amalgamated with the NCC since the Early Paleozoic. Thus, our new data suggest that the Alxa Block is most likely a separated Precambrian terrane from the Western Block of the NCC. Key words: North China Craton, Alxa Block, Neoproterozoic, S-type granite, zircon Hf-O isotopes introduction
Granites from South West England: A Global Heritage Stone Resource
— The counties of Cornwall and Devon, England, have several extensive exposures of parts of a large Variscan granite intrusion. Granites of several textural varieties have been worked extensively in the past at numerous quarries and used widely for dimension and ornamental stone and in major engineering works in the United Kingdom …
Origins of the S-type Cape Granites (South Africa)
— Thermobarometry using the mineral assemblage (Cpx-Amp–Pl–Bt–Qtz) from a metamafic xenolith result in a peak P-T estimate of 10 ± 1 kb and 850 ± 50 °C. This is …
Granite Rocks: Identification, Characteristics, …
— The mineral composition of granite plays a crucial role in its formation process. Here are three key points to understand about the composition and mineralogy of granite: Mineral Composition: Granite is …
Geochronology, geochemistry, and isotope compositions of …
— Besides, the metasedimentary sequence associated with the S-type granites in the North Qinling unit contains abundant hydrous minerals such as biotite and …
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Origin and genesis of Late Jurassic to Early Cretaceous granites of the
— The NQT is subdivided into three units that are separated by ductile shear zones and thrust faults. From north to south, these units are the Kuanping, Erlangping, and Qinling groups (e.g., Dong et al., 2011; Ratschbacher et al., 2003).The Kuanping Group forms the northernmost part of the NQT and is separated from the Erlangping Group to …
Whole-rock and zircon geochemistry of the Xiaoliugou granites, North …
— Semantic Scholar extracted view of "Whole-rock and zircon geochemistry of the Xiaoliugou granites, North Qilian Orogen (NW China): Implications for tectonic setting, magma evolution and W–Mo mineralization" by Tianwei Wang et al. ... Minerals. 2022; The Tuwu-Yandong porphyry Cu belt is located on the southern margin of the Dananhu …
Reliance of physico-mechanical properties on petrographic
— The relationship between the mechanical properties and petrographic features of granites from the Utla area, north-west Pakistan, was studied. Three different textural varieties of granites (megacrystic coarse-grained, fine-grained and foliated coarse-grained) were collected. Following a comprehensive petrographic analysis, their uniaxial …
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Association of Neoproterozoic A- and I-type granites in South …
— @article{Zhao2008AssociationON, title={Association of Neoproterozoic A- and I-type granites in South China: Implications for generation of A-type granites in a subduction-related environment}, author={Xin-Fu Zhao and Mei‐Fu Zhou and Jian-wei Li and Fu-Yuan Wu}, journal={Chemical Geology}, year={2008}, volume={257}, pages={1 …
Lithium isotopic systematics of granites and pegmatites …
— The δ 7 Li values of Proterozoic metasedimentary rocks that are possible sources of the Harney Peak Granite range from −3.1 to +2.5 and overlap with post-Archean shales and the Harney Peak Granite. For the granite suite, there is no correlation between δ 7 Li and elements indicative of degrees of granite differentiation (SiO 2, Li, Rb, etc ...
Petrogenesis and tectonic significance of early Indosinian …
— The Xinxing granitic pluton is a large batholith cropping out in southern South China with its long axis parallel to the regional NE–trending faults. We conduct the first comprehensive study of zircon laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) U–Pb chronology and trace element chemistry, rock-forming …
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I-type and S-type granites in the Earth's earliest continental …
— Our results reveal that although some Jack Hills zircons may be derived from trondhjemite-tonalite-granodiorite series rocks, which were common during the Archean …
Petrogenesis and tectonic implications of cambrian Nb-enriched …
— The HFSE enrichment feature was inherited by granites and further enhanced by protracted crystal fractionation at low oxygen fugacity conditions to produce the TL aluminous A1-type granites but ...
The trace element compositions of S-type granites: evidence …
— Trace elements such as Rb, Ba, Sr and Eu, that are concentrated in reactant minerals in the melting process, show considerable scatter within the granites. This is …
Petrogenesis and geochemical diversity of Late …
— More importantly, similar to typical more mafic S-type granites from the Cape Granite Suite (South Africa) and north Queensland (Australia), the high and variable FeO T + MgO contents (2.21–6.64 wt%) are significantly attributed to coupled co-entrainment of peritectic and accessory minerals (e.g., garnet, ilmenite, zircon, and monazite ...
Report No. 47985-YE Yemen Mineral Sector Review
The only current IM mining (exploitation) operations are for sand and aggregate (limestone, granite and basalt), gypsum and salt quarries, often carried out by local companies in an …
Minerals | Special Issue : Petrogenesis, Geochronology, …
— Feature papers represent the most advanced research with significant potential for high impact in the field. A Feature Paper should be a substantial original Article that involves several techniques or approaches, provides an outlook for future research directions and describes possible research applications.
Introduction to the origin of granites and related rocks
— Papers in this volume report progresses in mineralogical, petrological, geochronological and geochemical studies of granites and related rocks, with tectonic …
S-type granites and their probable absence in southwestern North
All are low in Na, Ca, and Sr as a result of chemical weathering during formation of the sedimentary sources. Peraluminous granites of various ages in southwestern North America are distinctly different. They rarely contain cordierite (a mineral characteristic of LFB S-types), but some are highly evolved such that Fe-Mn-rich garnet has ...
South China continental margin signature for sandstones and granites …
— We report results of heavy mineral analysis and U–Pb dating of detrital zircons from metasediments and Cenozoic sandstones, and U–Pb dating of zircons from Cenozoic granites of the North Palawan Continental Terrane (NPCT) and the South Palawan Terrane (SPT). The NPCT metasediments are derived mainly from granitic and …