English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The Monesterio granodiorite, a small granodioritic body placed in a migmatitic complex in the SW of the Olivenza-Monesterio antiform, is a key plutonic body to understanding the relationships among the magmatism, metamorphism, and deformation in the Ossa-Morena Zone, SW Iberian Massif. We dated the granodiorite with the single zircon stepwise-evaporation 207Pb/206Pb method, and the related migmatization event with the Rb-Sr method on leucosomes. Our results indicate that the Monesterio granodiorite crystallised at 510 &#194;&#177; 7 Ma and its protolith had a component with Upper Proterozoic zircons with a minimum age of 1696 Ma. Leucosomes give a Rb-Sr age of 511 &#194;&#177; 40 Ma (MSWD =1,7) with initial 87Sr/86Sr =0.70914 &#194;&#177; 0.00048. The lower initial 87Sr/86Sr of the granodiorite and its calc-alkaline chemistry precludes it from having derived from the same protolith as the migmatites. The existence of different magmatic bodies in the Ossa-Morena Zone with ages clustering around 500-510 Ma reveals the existence of a significant melting event during the Late Cambrian that involved protoliths with very different geochemical and isotopic signatures. La granodiorita de Monesterio es un peque&#241;o cuerpo emplazado en un complejo migmat&#237;tico en el SO del antiforme Olivenza-Monesterio, importante para entender las relaciones entre magmatismo, metamorfismo y deformaci&#243;n en la Zona de Ossa-Morena. Se ha datado la granodiorita por el m&#233;todo de evaporaci&#243;n secuencial de 207Pb/206Pb en cristal &#250;nico de circ&#243;n y los leucosomes de las migmatitas circundantes por el m&#233;todo Rb-Sr. Los datos indican una edad de cristalizaci&#243;n de la granodiorita de 510 &#194;&#177; 4 Ma y un posible protolito Proterozoico Superior con una edad m&#237;nima de &#226;&#136;&#188;1.700 Ma, obtenida a partir de n&#250;cleos heredados de los circones analizados. Los leucosomes dan una edad Rb-Sr de 511 &#194;&#177; 40 Ma, con una relaci&#243;n 87Sr/86Sr=0,70914 &#194;&#177; 0,00048. La relaci&#243;n inicial de 87Sr/86Sr en la granodiorita (&#226;&#136;&#188;0,7049) es mucho m&#225;s baja que en los leucosomes, lo que junto con su naturaleza calcoalcalina indica que no derivan del mismo protolito. La existencia en la zona de Ossa-Morena de diferentes cuerpos magm&#225;ticos con edades en tomo a 500-510 Ma, indica un evento de fusi&#243;n importante durante el C&#225;mbrico Superior desarrollado sobre protolitos con caracter&#237;sticas geoqu&#237;micas e isot&#243;picas muy diferentes

estudios geológicos

Rb-Sr and single - zircon grain 207Pb / 206Pb chronology of the Monesterio granodiorite and related migmatites. Evidence of a Late Cambrian melting event in the Ossa-Morena Zone, Iberian Massif