Petrographic, Geochemical and Isotopic (Sr–Nd–Pb–Os) Study of Plio-Quaternary Volcanics and the Tertiary Basement in the Jorullo-Tacámbaro Area, Michoacán-Guanajuato Volcanic Field, Mexico

Abstract The origin of the large diversity of rock types erupted along the subduction-related Trans-Mexican Volcanic Belt (TMVB) remains highly debated. In particular, several hypotheses have been proposed to explain the contemporary eruption of calc-alkaline and alkaline magmas along the belt. The Michoacán-Guanajuato Volcanic Field (MGVF) is an atypical, vast region of monogenetic activity located in the western-central part of the TMVB. Here we present new petrographic, geochemical, and isotopic (Sr–Nd–Pb–Os) data on recent volcanics in the Jorullo-Tacámbaro area that is the closest to the oceanic trench. TMVB-related volcanics in this area are Plio-Quaternary (<5 Ma) and mainly form a calc-alkaline series from basalts to dacites, with rare (<5 vol. %) alkaline rocks that range from trachybasalts to trachydacites, and transitional samples. Crystal textures are consistent with rapid crystallization at shallow depth and processes of mixing of similar magma batches (magma recharge). All of the samples exhibit an arc-type trace element pattern. Alkaline and transitional magmas have higher Na2O and K2O, lower Al2O3, and higher concentrations in incompatible elements (e.g. Sr, K, Ba, Th, Ce, P) compared to calc-alkaline rocks. Calc-alkaline rocks are similar isotopically to transitional and alkaline samples, except for a few low 87Sr/86Sr samples. Sr, Nd and Pb isotopes do not correlate with MgO or 187Os/188Os, indicating that they were not significantly influenced by crustal contamination. Isotopic and trace-element systematics suggest that the Tacámbaro magmas are produced by melting of a mantle wedge fluxed by fluids derived from a mixture of subducted sediments and altered oceanic crust. Alkaline and transitional magmas can be derived from a lower degree of partial melting of a similar source to that of the calc-alkaline rocks, whereas the few low 87Sr/86Sr calc-alkaline rocks require a lower proportion of fluid derived from oceanic sediments and crust. Volcanism at the trenchward edge of the MGVF was thus driven purely by subduction during the last 5 Ma, hence discarding slab rollback in this sector of the TMVB.

Download Full-text

The Fluid Mobilities of K and Zr in Subduction Zones: Thermodynamic Constraints

Minerals ◽

10.3390/min11040394 ◽

2021 ◽

Vol 11 (4) ◽

pp. 394

Author(s):

Richen Zhong ◽

Min Zhang ◽

Chang Yu ◽

Hao Cui

Keyword(s):

Trace Element ◽

Subduction Zones ◽

Critical Role ◽

High Field Strength ◽

Trace Element Pattern ◽

Arc Magmas ◽

Thermodynamic Simulations ◽

Element Pattern ◽

Element Transfer ◽

Complex Ion

A subduction zone plays a critical role in forging continental crust via formation of arc magmas, which are characteristically enriched in large ion lithophile elements (LILEs) and depleted in high field strength elements (HFSEs). This trace element pattern results from the different mobilities of LILEs and HFSEs during slab-to-wedge mass transfer, but the mechanisms of trace element transfer from subducting crusts are not fully understood. In this study, thermodynamic simulations are carried out to evaluate the mobilities of K and Zr, as representative cases of LILE and HFSE, respectively, in slab fluids. The fluids buffered by basaltic eclogite can dissolve > 0.1 molal of K at sub-arc depths (~3 to 5.5 GPa). However, only minor amounts of K can be liberated by direct devolatilization of altered oceanic basalt, because sub-arc dehydration mainly takes place at temperatures < 600 °C (talc-out), wherein the fluid solubility of K is very limited (<0.01 molal). Therefore, serpentinite-derived fluids are required to flush K from the eclogite. The solubility of K can be enhanced by the addition of NaCl to the fluid, because fluid Na+ can unlock phengite-bonded K via a complex ion exchange. Finally, it is further confirmed that Zr and other HFSEs are immobile in slab fluids.

Download Full-text

Correction to “Isotopic and trace element constraints on the origin and evolution of alkaline and calc-alkaline magmas in the northwestern Mexican volcanic belt” by Surendra P. Verma and Stephen A. Nelson

Journal of Geophysical Research Atmospheres ◽

10.1029/jb094ib06p07679 ◽

1989 ◽

Vol 94 (B6) ◽

pp. 7679 ◽

Cited By ~ 8

Author(s):

Surendra P. Verma ◽

Stephen A. Nelson

Keyword(s):

Trace Element ◽

Volcanic Belt ◽

Calc Alkaline ◽

Origin And Evolution ◽

Mexican Volcanic Belt ◽

Alkaline Magmas

Download Full-text

Sr, Nd, and Pb isotopic and trace element geochemical constraints for a veined-mantle source of magmas in the Michoacan-Guanajuato Volcanic Field, west-central Mexican Volcanic Belt

GEOCHEMICAL JOURNAL ◽

10.2343/geochemj.38.43 ◽

2004 ◽

Vol 38 (1) ◽

pp. 43-65 ◽

Cited By ~ 32

Author(s):

Surendra P. Verma ◽

Toshiaki Hasenaka

Keyword(s):

Trace Element ◽

Mantle Source ◽

Volcanic Belt ◽

Volcanic Field ◽

West Central ◽

Mexican Volcanic Belt ◽

Geochemical Constraints

Download Full-text

Distinguishing High- from Low-Temperature Platinum Nuggets Through Their Trace-Element Pattern

Economic Geology ◽

10.5382/econgeo.2019.4627 ◽

2019 ◽

Vol 114 (2) ◽

pp. 201-206

Author(s):

Alexandre Raphael Cabral ◽

Thomas Zack ◽

Stephan König ◽

Benjamin Eickmann ◽

Rogerio Kwitko-Ribeiro ◽

...

Keyword(s):

Low Temperature ◽

Trace Element ◽

Trace Element Pattern ◽

Element Pattern

Download Full-text

Mineralogical–geochemical constraints on intrusives in central Anatolia, Turkey: tectono-magmatic evolution and characteristics of mantle source

Geological Magazine ◽

10.1017/s0016756805000476 ◽

2005 ◽

Vol 142 (2) ◽

pp. 187-207 ◽

Cited By ~ 46

Author(s):

N. İLBEYLİ

Keyword(s):

Mantle Source ◽

Central Anatolia ◽

Alkaline Magmatism ◽

Calc Alkaline ◽

Alkaline Rocks ◽

Rock Types ◽

Slab Breakoff ◽

Wide Range ◽

Cretaceous Magmatism ◽

Geochemical Constraints

Collision-related rocks intrude metamorphic rocks overthrust by ophiolitic units to make up the Central Anatolian Crystalline Complex. A wide variety of rock types were produced by the latest Cretaceous magmatism in the complex. These rocks can be divided into three distinct units: (1) calc-alkaline (Ağaçören, Behrekdağ, Cefalıkdağ, Çelebi, Ekecikdağ, Halaçlı, Karamadazı, Kösefakılı, Terlemez, Üçkapılı, Yozgat); (2) sub-alkaline (Baranadağ); and (3) alkaline (Atdere, Davulalan, Eğrialan, Hamit, İdişdağı, Karaçayır). The calc-alkaline rocks are metaluminous/peraluminous I- to S-type plutons ranging from monzodiorite to granite. The sub-alkaline rocks are metaluminous I-type plutons ranging from monzonite to granite. The alkaline rocks are metaluminous to peralkaline plutons, predominantly A-type, ranging from foid-bearing monzosyenite to granite. These plutons crystallized under varying pressures (5.3–2.6 kbar) and a wide range of temperatures (858–698 °C) from highly oxidized magmas (log fO2 −17 to −12). All intrusive rocks display enrichment in LILE and LREE compare to HFSE and have high 87Sr/86Sr and low 143Nd/144Nd ratios. These characteristics indicate that these rocks are derived from a mantle source containing large subduction components, and have experienced assimilation coupled with fractional crystallization (AFC) during uprise through crust. The coexistence of calc-alkaline and alkaline magmatism in the complex may be ascribed to mantle source heterogeneity before collision. Either thermal perturbation of the metasomatized lithosphere by delamination of the thermal boundary layer or removal of a subducted plate (slab breakoff) are the likely mechanisms for the initiation of the collision-related magmatism in the complex.

Download Full-text

Bone trace element pattern in an 18th century population sample of tenerife (Canary islands)

Biological Trace Element Research ◽

10.1007/bf02784113 ◽

1998 ◽

Vol 65 (1) ◽

pp. 45-51 ◽

Cited By ~ 5

Author(s):

M. Arnay-de-la-Rosa ◽

E. Gonzalez-Reimers ◽

J. Velasco-Vazquez ◽

N. Barros-Lopez ◽

L. Galindo-Martin

Keyword(s):

Trace Element ◽

Canary Islands ◽

18Th Century ◽

Population Sample ◽

Trace Element Pattern ◽

Element Pattern

Download Full-text

Isotope geochemistry and deep sources of subalkaline and alkaline rocks from the Paleogene contrasting series of the Amguema-Kanchalan volcanic field, Okhotsk-Chukotka volcanic belt

Doklady Earth Sciences ◽

10.1134/s1028334x0908011x ◽

2009 ◽

Vol 429 (1) ◽

pp. 1288-1294 ◽

Cited By ~ 3

Author(s):

V. F. Polin ◽

V. G. Sakhno ◽

S. O. Maksimov ◽

I. V. Sandimirov

Keyword(s):

Isotope Geochemistry ◽

Volcanic Belt ◽

Volcanic Field ◽

Alkaline Rocks ◽

Chukotka Volcanic Belt ◽

Deep Sources

Download Full-text

Mineralogy, Geochemistry and Genesis of the Luc Yen Noble Spinel Deposit, Vietnam

10.35597/2313-545x-2019-5-3-56-69 ◽

2019 ◽

Vol 5 ◽

pp. 56-69

Author(s):

K.A. Kuksa ◽

P.B. Sokolov ◽

O.Yu. Marakhovskaya ◽

G.A. Gussias ◽

W. Brownscombe

Keyword(s):

Trace Element ◽

Trace Element Geochemistry ◽

Element Geochemistry ◽

Trace Element Pattern ◽

Mineral Inclusions ◽

Icp Ms ◽

Element Pattern ◽

Mineral Assemblages ◽

North Vietnam ◽

Petrographic Study

The paper presents the detailed mineralogical and petrographic study of spinel-bearing marbles at the Luc Yen deposit, North Vietnam. The LA-ICP-MS analysis of 74 spinel grains, combined with mineralogical data, allows us to discriminate them into fve types according to mineral assemblages and trace element geochemistry. Forty seven minerals are identifed as inclusions in spinel grains and 38 minerals are described at Luc Yen deposit for the frst time including leonardsenite, tintisite, manasseite, chalcoalumite, cobaltite and spherocobaltite. The mineral assemblages, trace element pattern, and specifc mineral inclusions indicate the involvement of hydrothermal fuids related to magma intrusions in the formation of, at least, two of fve spinel types at the deposit.

Download Full-text