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  • 40Ar-39Ar Dating of Potash Feldspar in Laoka Granite and

    The result shows that the K-feldspar of the Laoka rock mass has an 40 Ar-39 Ar plateau age of 71.6±0.29 Ma and that the alteration phlogopite in the Laochang and Kafang "basalt-type" copper deposits have an 40 Ar-39 Ar plateau age of 81.99±0.85 Ma and 82.46±0.85 Ma respectively which means that these minerals were formed in

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  • REE composition of primary and altered feldspar from the

     · Feldspar phenocryst grains separated from coarse crushes were mounted on double sided tape and cast into epoxy disks overnight. The grains in hardened resin were exposed with 1200-mesh silicon carbide paper and then diamond polished for SEM analysis followed by ICPMS analysis which does not need a polished surface.

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  • Feldspar microboudinage paleopiezometer and its

     · Feldspar which is the most abundant crustal mineral exhibits brittle behavior while quartz and mica deform plastically by dislocation creep under the greenschist-facies conditions (300–450 °C).

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  • Comparative Rock Magnetic Study of Eocene

    Quartz and feldspar are the primary minerals in the fine-grained muddy matrix (Figures 3k and 3l) together with small subrounded detrital magnetic minerals (Figures 3q and 3r). Enlarged views of the micrographs (Figures 3 m– 3 r) reveal a clearly decreasing magnetic mineral concentration from trachy-andesite to volcanic tuff to sedimentary rock.

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  • Accumulated phenocrysts and origin of feldspar porphyry

    The No. 1 feldspar porphyry in the Chanho area western Yunnan China is characterized by the development of deformed glomeroporphyritic aggregates (GA) that contain diagnostic gravity settling textures. These textures include interlocking curved grain boundaries caused by compaction bent twins and arch-like structures. The GAs are accumulated phenocrysts (AP) and antecrysts.

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  • Hydrochemical Characteristics and Formation of the

    The red beds exist in the western southern and central Yunnan which mainly consist of the purple mudstone and small amounts of feldspar quartz sandstone and occupy around one-third of the area of Yunnan Province . Tectonically Yunnan Province is located in the Indian Ocean Plate and Eurasian Plate collision zone and its affected area.

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  • Crystallisation conditions (T P fO2) from mineral

     · The Oligocene Yao an syenite porphyry associated with gold mineralisation and the Machangqing alkali granite porphyry–monzonite porphyry associated with Cu mineralisation belong to the Red River–Jinshajiang alkaline igneous belt that formed in a continental setting in southwestern China. A study of the mineral chemistry of major silicate minerals in these two mineralised intrusions

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  • The Optional Study of Refined Feldspar Processing from

    The low-grade feldspar from kyanite tailings were studied through the magneticAnti-flotation purification method. The ore grade of iron was decraded from 0.98 to

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  • Structural constraints on the timing of left-lateral shear

    Along the Ailao Shan (ALS) and Diancang Shan (DCS) ranges in Yunnan SW China early amphibolite facies metamorphic rocks were intruded by K-feldspar orthogneisses of Triassic age (Indosinian). LA-ICP-MS U-Pb zircon dating reveals a complex history with zircon cores showing evidence of Indosinian (∼239–243 Ma) to Neoproterozoic magmatism.

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  • Accumulated phenocrysts and origin of feldspar porphyry

    The No. 1 feldspar porphyry in the Chanho area western Yunnan China is characterized by the development of deformed glomeroporphyritic aggregates (GA) that contain diagnostic gravity settling

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  • Structural petrological and thermal evolution of a

     · K-feldspar hornblende biotite and white mica min- eral separates were obtained using heavy liquid and magnetic separatory techniques from fresh hand spec- imens. Approximately 15 mg each of K-feldspar and hornblende and 5 mg of mica were wrapped in Sn foil and sealed in 6-mm ID evacuated quartz glass vials to-

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  • Journal of Asian Earth Sciences

     · quartz–feldspar porphyritic stocks each <50 m long in plan view with a whole-rock Rb–Sr age of about 216 Ma (Yunnan Bureau of Geology and Mineral Resources 1990) lie in the western parts of the Hongshan district. Some buried molybdenite- bearing layered or lenticular granite-porphyry bodies also are present in deeper

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  • Dayakou emerald mine Malipo County Wenshan Yunnan

    Dayakou emerald mine Malipo County Wenshan Yunnan China Emerald-bearing quartz and pegmatite veins hosted in Cambrian metamorphic rocks at the eastern contact of the Yanshannian Laojunshan granite. The veins were intruded during the Cretaceous.

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  • Geochronological isotopic and mineral geochemical

     · The Diyanqinamu Mo deposit ( 120 km NE of Uliastai northern-central part of the Great Xing an Range) is situated in the eastern Central Asian Orogenic Belt (CAOB) between the Siberian Craton in the north and the North China Craton in the south (Fig. 1A B) (Jahn 2004 Jahn et al. 2000 Li 2006 Shen et al. 2012).The eastern CAOB has recorded a complex tectonic evolution history

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  • Sedimentary provenance constraints on drainage

    after Yunnan Bureau of Geology and Mineral Resources 1990 . (b) Sedimentary logs from three sections in the Xigeda Formation showing the lithology paleocurrent data and samples collected for Pb isotopic analysis of detrital K-feldspar.

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  • Crystallisation conditions (T P fO2) from mineral

     · The Oligocene Yao an syenite porphyry associated with gold mineralisation and the Machangqing alkali granite porphyry–monzonite porphyry associated with Cu mineralisation belong to the Red River–Jinshajiang alkaline igneous belt that formed in a continental setting in southwestern China. A study of the mineral chemistry of major silicate minerals in these two mineralised intrusions

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  • The Machangqing copper-molybdenum deposits Yunnan

    The Machangqing copper-molybdenum deposits occur in the Shanjian fold belt Yunnan Province China. Two types of ores are distinguished (1) Cu-Mo quartz veinlets in magnetite-series granite porphyry and (2) Cu-Mo skarns occurring at the contact between the

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  • Lincang Yunnan ChinaMindat

    ⓘ Feldspar Group Mineralization of Luziyuan Pb–Zn skarn deposit Baoshan Yunnan Province SW China evidence from petrography fluid inclusions and stable isotopes. Geological Magazine. 1-20. 10.1017/SX.

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  • Pink Tourmaline on Feldspar Yunnan Province China eBay

    A grouping of pink tourmaline is scattered about the white feldspar making for nice contrast. The piece is from Nujiang Valley Yunnan Province China. The piece measures 6 cm wide by 2.5 cm tall by 3 cm front to back. There is damage around the outer edge and nicks to the crystal edges.

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  • Accumulated phenocrysts and origin of feldspar porphyry

    Abstract The No. 1 feldspar porphyry in the Chanho area western Yunnan China is characterized by the development of deformed glomeroporphyritic aggregates (GA) that contain diagnostic gravity settling textures. These textures include interlocking curved grain boundaries caused by compaction bent twins and arch-like structures. The GAs are accumulated phenocrysts (AP) and antecrysts.

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  • Potassic Magmatism in Western Sichuan and Yunnan

    Potassic volcanism in the western Sichuan and Yunnan Provinces SE Tibet forms part of an extensive magmatic province in the eastern Indo-Asian collision zone during the Paleogene (40–24 Ma). The dominant rock types are phlogopite- clinopyroxene- and olivine-phyric calc-alkaline (shoshonitic) lamprophyres.

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  • Evidence for deformation‐induced K‐feldspar replacement

    Yanlong Dong Shuyun Cao Xuemei Cheng Junlai Liu Hanchen Cao Grain-size reduction of feldspar and flow of deformed granites within the Gaoligong shear zone southwestern Yunnan China Science China Earth Sciences 10.1007/s (2019).

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  • (PDF) Grain-size reduction of feldspar and flow of

    Grain-size reduction of feldspar and flow of deformed granites within the Gaoligong shear zone southwestern Yunnan China May 2019 Science China Earth Science 62(9)

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  • The alkaline porphyry associated Yao an gold deposit

     · The Yao an vein-type gold deposit is located in the Ailaoshan-Jinshajiang alkaline intrusive belt Yunnan Province China and is associated both in time and space with 33.5±1.0-Ma-old alkaline intrusions. The gold mineralization is associated with potassic wall-rock alteration.

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  • Hydrochemical Characteristics and Formation of the

    The red beds exist in the western southern and central Yunnan which mainly consist of the purple mudstone and small amounts of feldspar quartz sandstone and occupy around one-third of the area of Yunnan Province . Tectonically Yunnan Province is located in the Indian Ocean Plate and

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  • Mineralogical and chemical characteristics of a powder

    For comprehensive utilization of powder quartz a detailed mineralogical analysis is needed. In this paper the minerals collected from a powder quartz deposit in Yunnan Province and its purification products were characterized by X-ray diffraction (XRD) chemical composition and scanning electron microscopy (SEM) analyses. The raw powder quartz deposit had a simple mineral composition made

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  • (PDF) 📄 Mineralogical and chemical characteristics of a

    The raw powder quartz deposit had a simple mineral composition made of 85 quartz and 15 clay minerals kaolinite and illite with a trace amount of feldspar. It had narrow particle size

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  • Granite gabbro and mafic microgranular enclaves in the

     · Geochronological geochemical whole-rock Sr–Nd and zircon Hf isotopic analyses were carried out on the Jiasha Gabbro mafic microgranular enclaves (MME) and host Longchahe Granite samples from the Gejiu area in the southeast Yunnan province SW China with the aim of characterizing their petrogenesis. Compositional zoning is evident in the gabbro body as the cumulate textures and

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  • Magnitude and symmetry of seismic anisotropy in mica‐

    The thickness of the crust beneath west Yunnan between the Ailao Shan-Red River fault zone and the Nabang fault zone increases northward Sun et al. 2014 Wang et al. 2010 . The thickness of the lithosphere beneath west Yunnan Hu et al. 2014 is about 80–100 km which is

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  • Mineralogical and chemical characteristics of a powder

    For comprehensive utilization of powder quartz a detailed mineralogical analysis is needed. In this paper the minerals collected from a powder quartz deposit in Yunnan Province and its purification products were characterized by X-ray diffraction (XRD) chemical composition and scanning electron microscopy (SEM) analyses. The raw powder quartz deposit had a simple mineral composition made

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  • (2009) Os-Nd-Sr-Pb . 25 . 41). Hieu PT Chen F Le Thanh Me Vu Le Tu Nguyen Thuy T-B (2009) Zircon U-Pb age of granite from the Ye Yen

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  • Geology and Genesis of the Giant Pulang Porphyry Cu-Au

     · The giant Pulang porphyry Cu-Au district (446.8 million tonnes at 0.52 Cu and 0.18 g/tonne Au) is in the southern segment of the Yidun arc (Zhongdian arc) part of the Sanjiang Tethyan orogenic belt in southwest China.

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  • Accumulated phenocrysts and origin of feldspar porphyry

     · The No. 1 feldspar porphyry in the Chanho area western Yunnan China is characterized by the development of deformed glomeroporphyritic aggregates (GA) that contain diagnostic gravity settling textures. These textures include interlocking curved grain boundaries caused by compaction bent twins and arch-like structures.

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  • Geometry kinematics and regional significance of the

    Some feldspar grains especially plagioclase show brittle fractures. The contrast between quartz and feldspar deformation indicates temperatures were probably between 350° and ∼500 °C. Muscovite from 99JU4.2 yielded an age of ca. 19.4 Ma and biotite from sample 99M18.6 yielded an age of ca. 17.3 Ma.

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