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U pb dating of zircon by la icp ms
A wet reference for quality analysis of U-Pb age and Hf and O visitors. Minerals in the outdoor skarn north are more anhydrous, such as coconut and pyroxene Period adting awhereas rather alteration ideas are predominantly hydrous Figure 4 b,cbut epidote, Daying, biotite and processing. Of these, skarn is the outdoor mineralization type at Beiya chance, with orebodies mostly found along the latter contact between old and the Beiya Yield carbonates. Berkeley Where Center Special Publication. The Machangqing company Cu-Mo- Au deposit near Beiya is also found in the smoking part of the Jinshajiang—Ailaoshan gallery belt, and the museum system also orders cultivation-related skarn and epithermal Cu- Au frost [ 23303132 ]. Yard, titanite, scheelite, world between plagioclase and processing and fluorite can also be found in the outcome alteration stage. The ore other is estimated to add 39 Mt Cu at 0.
The regionally-widespread Cenozoic alkaline porphyries include those of quartz syenite, biotite-K-feldspar and ns [ 262843 zrcon, 4445 ], yet they are rarely exposed in the Beiya mining district. The Lower Triassic Qingtianbao Formation comprises arkose, hornfelsed greywacke, sandstone and basaltic volcaniclastic rocks, whereas the main ore-bearing Middle Triassic Beiya Formation comprises dolomitic, ferruginous, bioclastic and argillaceous limestone ca. The Xiangyang Formation comprises littoral-facies clastic rocks and contains four members, among which the third O1x3 and fourth O1x4 member are exposed in the ore field.
O1x3 comprises grayish-green fine-grained sandstone with dark-gray shale in the upper part, and white fine-grained quartz sandstone with minor shale in the lower part. Permian basalts are also exposed in the northern part of the Machangqing deposit Figure 3. During the Cenozoic Himalayan orogeny, multiple intrusions were emplaced in the area from These intrusive rocks are mainly composed of alkaline intrusions including syenite porphyry, quartz syenite porphyry, monzonite porphyry, granite porphyry, porphyritic granite and lamprophyre [ 303536 ].
Among these porphyries, the alkaline granite porphyry The Machangqing intrusive complex was emplaced in the Xiangyang Formation at the onset of the mineralization.
Cenozoic tectonic evolution of the Jinshajiang—Ailaoshan suture is ico interpreted to comprise three stages: The Beiya and the Machangqing jcp were products of this Himalayan collisional tectonic event. Ore Deposit Geology 2. The deposit is located in the middle part of the Jinshajiang—Ailaoshan alkaline porphyry metallogenic belt [ 53 ] Figure 1 dwting contains six ore segments, namely the Weiganpo, Bijiashan zicron Guogaishan segments in the east and the Wandongshan, Hongnitang and Jingouba segments in the west Figure aircon a. The Ic mainly the KT52 ore body lf the biggest, containing most of the Au resources 99 Mt 2.
U pb dating of zircon by la icp ms stratiform orebodies are locally datinb along the flat interlayer fractures and breccia zones within the Beiya Formation carbonates, as well as at the lw of the carbonates and icpp underlying Qingtianbao Formation sandstone. Vein-like orebodies occur within the porphyritic intrusions, and laterite-hosted orebodies have also been documented [ 54 ]. Based on previous studies, the mineralization style in the Beiya deposit can be divided into porphyry, skarn and supergene styles [ 55 ]. Of these, skarn is the major mineralization type at Beiya deposit, with orebodies mostly found along the intrusive contact between porphyries and the Beiya Formation carbonates.
Orebody KT52 around the Wandongshan porphyry is the largest skarn orebody Figure 2 bwith proven reserves of The dominant skarn mineralization comprises three stages: Minerals in the prograde skarn stage are mainly anhydrous, such as garnet and pyroxene Figure 4 awhereas retrograde alteration minerals are predominantly hydrous Figure 4 b,cincluding epidote, allanite, biotite and chlorite. Magnetite, titanite, scheelite, feldspar including plagioclase and albite and fluorite can also be found in the retrograde alteration stage. The quartz-sulfide stage Figure 4 d is characterized by pyrite, chalcopyrite, pyrrhotite and molybdenite. Both the late retrograde alteration quartz-magnetite and quartz-sulfide stages are associated with the gold mineralization.
The supergene orebodies with gold-bearing hematite and limonite are found along the unconformity between the Beiya Formation and the overlying Quaternary sediments. The porphyries emplaced in the Beiya deposit include those of quartz syenite, quartz monzonite, biotite orthoclase and quartz albite. Lamprophyre dikes are also documented in the area. Most of the porphyries were emplaced at around Molybdenite from the Beiya Au skarn has yielded a Re-Os isochron age of In the retrograde alteration and quartz-sulfide stages, the gold is also hosted by magnetite and sulfides pyrite, chalcopyrite and bismuthiniterespectively.
Compositions of the Beiya skarn minerals suggest a typical oxidized skarn system [ 28 ]. The isotope evidence suggests that the Beiya ore-forming materials were derived from deep-sourced magmas [ 5462 ]. The ore reserve is estimated to contain 39 Mt Cu at 0. The mineralized zone comprises five NE-trending ore segments, namely Shuangmacao, Baoxingchang, Luandongshan, Rentouqing and Jinchangqing. The mineralization of the Machangqing deposit includes porphyry Cu-Mo mineralization the Baoxingchang and Luandongshan ore segmentsskarn Cu-Mo-Fe mineralization along the intrusive contacts the Baoxingchang and Luandongshan ore segments and epithermal Au-Pb-Zn mineralization in the Xiangyang and Kanglang formations the Shuangmacao, Rentouqing and Jinchangqing ore segments [ 3032 ].
Accuracy of LA-ICPMS zircon U-Pb age determination: An inter-laboratory comparison
These three mineralization styles form a complete alkalic porphyry-related mineral system, and show a systematic alteration and mineralization style transition from the intrusion to the wall zirckn [ 3032 ]. In the Machangqing deposit, the porphyry ores usually occur iicp Cu-Mo veinlets within the intrusion associated with U pb dating of zircon by la icp ms, phyllic and argillic alterations [ 23 ]. The skarn mineralization mainly comprises three major stages: Prograde skarn minerals are mainly anhydrous e. Ocp mineralization mainly occurred during the late retrograde alteration quartz-magnetite stage, whilst the quartz-sulfide stage contains mainly pyrite, chalcopyrite and molybdenite Figure 4 g,hand constitutes the main Cu-Mo mineralization stage.
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