Large Igneous Province and magmatic arc sourced Permian–Triassic volcanogenic sediments in China

Fuzzification of continuous-value spatial evidence for mineral prospectivity mapping

Zircon petrochronology reveals the temporal link between porphyry systems and the magmatic evolution of their hidden plutonic roots (the Eocene Coroccohuayco deposit, Peru)

Petrogenesis of ore-bearing porphyries from the Duolong porphyry Cu-Au deposit, central Tibet: Evidence from U-Pb geochronology, petrochemistry and Sr-Nd-Hf-O isotope characteristics

The Apuseni – Banat – Timok – Srednogorie (ABTS) Late Cretaceous magmatic arc in the Carpathian –Balkan orogen formed on the European margin during closure of the Neotethys Ocean. It was subsequently deformed into a complex orocline by continental collisions. The Cu-Au mineralised arc consists of geologically distinct segments: the Apuseni, Banat, Timok, Panagyurishte and Eastern Srednogorie segments. New U-Pb zircon ages and geochemical whole rock data for the Banat and Apuseni segments are combined with previously published data to reconstruct the original arc geometry and better constrain its tectonic evolution. Trace element and isotopic signatures of the arc magmas indicate a subduction-enriched source in all segments and variable contamination by continental crust. The magmatic arc was active for 25 m.y. (~92-67 Ma). Across-arc age trends of progressively younger ages towards the inferred paleo-trench indicate gradual steepening of the subducting slab away from the upper plate European margin. This leads to asthenospheric corner flow in the overriding plate, which is recorded by decreasing 87Sr/86Sr (0.70577 to 0.70373) and increasing 143Nd/144Nd (0.51234 to 0.51264) ratios over time in some segments. The close spatial relationship between arc magmatism, large-scale shear zones and related strike-slip sedimentary basins in the Timok and Pangyurishte segments indicates mild transtension in these central segments of the restored arc. In contrast, the Eastern Srednogorie segment underwent strong orthogonal intra-arc extension. Segmental distribution of tectonic stress may account for the concentration of rich porphyry Cu deposits in the transtensional segments, where lower-crustal magma storage and fractionation favoured the evolution of volatile-rich magmas.

/pdf/tectonic-magmatic-and-metallogenic-evolution-of-the-late-6shcp8gicd.pdf

Tectonic, magmatic, and metallogenic evolution of the Late Cretaceous arc in the Carpathian‐Balkan orogen

Precise U–Pb geochronology, Hf isotope compositions and trace element distributions in zircons are combined in the present study to define the timing and sources of the magmatism forming the Medet porphyry copper deposit, Bulgaria. ID-TIMS U–Pb-zircon dating demonstrates that ore-bearing magmatism extended for less than 1.12 Ma. As inferred from the field relationships, it started with the intrusion of a quartz-monzodiorite at 90.59 ± 0.29 Ma followed by granodiorite porphyries at 90.47 ± 0.30 and 90.27 ± 0.60 Ma and by crosscutting aplite dykes at 90.12 ± 0.36 Ma. These units were overprinted by potassic alteration and host economic copper-(Mo–Au) mineralization. The main magmatic–hydrothermal activity ceased after that, and a later quartz-granodiorite porphyry dyke, dated at 89.26 ± 0.32 Ma, only contains an uneconomic quartz–pyrite mineralization. Assimilation of Lower Paleozoic rocks with a mantle to mantle–crust signature is characteristic of the fertile magma in the Medet deposit, as defined by positive ɛ-Hf values of the inherited zircons. The positive Ce-anomalies and the higher Eu/Eu* ratios of the zircons in the mineralized Cretaceous rocks of Medet deposit argue for crystallization from a generally more oxidized magma compared to the later quartz-granodiorite porphyry dyke. A change in paleostress conditions occurred during the intrusion of the Medet pluton and its dykes. The initial stage reveals E–W extension associated with N–S compression, whereas the younger granodiorite dyke was emplaced during subsequent N–S extension. The large-scale switch of the extensional stress regime during the mineralization was favourable for ore deposition by channelling the fluids and increasing the effective permeability.

/pdf/u-pb-dating-hf-isotope-characteristics-and-trace-ree-1zugnobfcf.pdf

U–Pb dating, Hf-isotope characteristics and trace-REE-patterns of zircons from Medet porphyry copper deposit, Bulgaria: implications for timing, duration and sources of ore-bearing magmatism

The Zidarovo ore field is situated 15-20 km south from the town of Bourgas. The region consists of Senonian volcanic, intrusive and sedimentary rocks. The syn-/postmagmatic hydrothermal activity was responsible for the formation of polymetallic and gold-polymetallic ore veins in the volcanic rocks. The ore mineralisation is developed in two sectors - Kanarata in the central part (close to the Zidarovo intrusive) and Yurta in the NNW part of the ore field. The composition of the volcanic rocks of the Zidarovo ore field varies from basaltic to trachy-andesitic. The sub-volcanic dyke complex has basaltic and trachy-basaltic composition, and the intrusive rocks are gabbroic to monzo-dioritic. The rock varieties belong to the high-K calc-alkaline magmatic series. Indicative bivariate diagrams as Nb vs. Y, Rb vs. (Y+Nb), Rb vs. (Yb+Ta) and Zr/Al 2 O 3 vs. TiO 2 /Al 2 O 3 define volcanic-arc tectonic environment of their formation. MORB normalized trace elements patterns of the magmatic rocks (enrichment of large ion lithophile elements and low values for high field strength elements, the strong negative Ta and Nb anomaly and the chondrite-normalized REE distribution of the basaltic rocks indicate subduction related magma affinity. Nd and Sr whole rock isotope data are in agreement with this conclusion revealing mantle-crustal signatures with e-Nd (80 Ma) values generally between +2.1 and +3.0 and initial strontium ratios in the narrow range 0.704-0.705. Compared with the data for the Central Srednogorie the magmatic rocks from the Zidarovo ore field are less crustal contaminated. The same trend is observed comparing intrusive and volcanic varieties - the volcanic rocks reveal more primitive isotope composition, which is explained by the faster cooling of the volcanites, probably prior to contamination with crustal materials in middle/upper crustal chambers.

http://www.mgu.bg/sessions/06/1/kr_ak_ip_sg_ss_sst.pdf

Geochemical and sr-nd isotope constraints on the late cretaceous magmatism in the area of the zidarovo ore field

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U–Pb dating, Hf-isotope characteristics and trace-REE-patterns of zircons from Medet porphyry copper deposit, Bulgaria: implications for timing, duration and sources of ore-bearing magmatism

Geochemical and sr-nd isotope constraints on the late cretaceous magmatism in the area of the zidarovo ore field