Incompatible element

About: Incompatible element is a research topic. Over the lifetime, 2420 publications have been published within this topic receiving 154052 citations.

Geology and petrology of the potassic and ultrapotassic rocks from the northern part of Senirkent (Isparta-SW Turkey): evidence of magma–carbonate wall-rock interactions

Abstract: Potassic, ultrapotassic lava domes, flows, and volcano-sedimentary deposits including leucite-bearing and leucite-free grains crop out to the north of Senirkent (Isparta), at the apex of the Isparta Angle (southwestern Turkey). Ultrapotassic rocks are nepheline-foidolite, italite, leucitite, melilite leucitite, melilite-gehlenite leucitite, diopside leucitite, and leucitophyre with lowest SiO2 content (38.71–44.72 wt%, but the leucitophyre has 51.4 wt%), higher K2O (4.36–10.19 wt%), MgO (3.25–6.98 wt%), and K2O/Na2O ratio (2.65–32.8). Potassic rocks are phonolitic leucitites, sanidine-phyric phonolite, and trachytes with SiO2 (49.35–64.46 wt%), K2O (8.28–11.38 wt%), MgO (0.17–1.39 wt%), and K2O/Na2O ratio (2.25–11.8). Some leucitites, diopside leucitites, and phonolitic leucitites enclose partly carbonatite occurences or associated with carbonate-rich part including carbonatite globules, phlogopite, clinopyroxene, and/or leucite, melanite crystals embedded in glassy volcanic matrix and/or carbonate matrix. Primitive mantle-normalized incompatible element patterns display strong enrichments in LILEs (Cs, Rb, Ba, U, Th, Sr) relative to HFSEs (Nb, Ti) with distinct negative Nb–Ti anomalies, suggesting subduction-related lavas. Chondrite-normalized REE patterns are characterized by light REE enrichment (251–493 times chondrite for La) and flat heavy REE patterns (10–27 times chondrite for Yb). All the leucite-bearing and leucite-free rocks display similar, subparallel chondrite-normalized and primitive mantle-normalized trace element patterns, suggesting cogenetic origin. Mineralogical, petrological, and geochemical data suggest magma–carbonate wall-rock interaction and tapping of different parts of the melts within the magma chamber along the fault lines formed during neotectonic period and extension-related block faulting.

Zircon U-Pb geochronology and geochemistry of Hanzheganeng Cu-Au deposit in West Junggar,Xinjiang: Implications for magma source and metallogenic tectonic setting.

Abstract: Hanzheganeng Cu-Au deposit,located in northwestern margin of Junggar,is a newly discovered porphyry copper deposit with great potential.Magmatic emplacement activity is mainly diorite in the early stage,and is mainly granodiorite and moznogranite porphyry in the late stage.Porphyraceous quartz monzonite yields a LA-ICP-MS zircon U-Pb age of 343.6±5.7Ma~345.3±8.3Ma,and monzogranite porphyry yields a zircon age of 334.9±7.3Ma~336.4±7.5Ma.These ages indicate that there is an Early Carboniferous important magmatic-hydrothermal Cu-Au mineralization event in Sawuer region of West Junggar.Major elements of granodiorite,quartz monzonite,diorite porphyrite,diorite,and monzogranite porphyry show a consistent evolution trend,indicating that they may be the product of the same magmatic evolution.And their geochemical characteristics of enriching in large-ion lithophile elements(LILE: such as Rb,Ba,K,Sr) and more mobile incompatible elements(such as: U,Th),relatively depleting in high field strength elements(HFSE: such as Nb,Ta,Ti) show that they have the characteristics of arc magma.Their isotopic characteristics with 87Sr/86Sri ratio of 0.7033~0.7037,143Nd/144Nd ratio of 0.512538~ 0.512579,eNd(t) value of +6.7~+7.5,indicate their magma source is an analogy of the depleted mantle.And they have young Nd two-stage model age of 488~553Ma,indicating that Hanzheganeng magmatic rocks may be derived from juvenile basaltic lower crust differentiated from the depleted mantle source.The formation age of Hanzheganeng Cu-Au deposit is significantly earlier than the formation age of A-type granites(290~300Ma) in this region,combined with trace element characteristics,suggest this deposit was formed in accretional arc setting,and Sawuer district have favorable metallogenetic conditions for porphyry Cu-Au deposits.