Verde Bamboo Granite (epidotic metasandstone) (Ipuçaba Formation, Mesoproterozoic, 1.6-1.7 Ga; Bahia, Brazil) 2

            "Verde Bamboo Granite" - epidote-rich metasandstone from the Precambrian of Brazil.

This beautiful, green-and-black decorative stone is an odd metamorphic rock that was originally a siliciclastic deposit (the Ipuçaba Formation) in a deltaic-lacustrine environment, interpreted in part as turbiditic rhythmites.  The Ipuçaba Formation principally consists of metamorphosed arkoses, calcareous arkoses, and rhythmites (= alternating sandstones & fine-grained siliciclastic beds).  Hornfels-grade metamorphism (high-temperature, low-pressure) occurred at ~1.5 Ga during the intrusion of nearby mafic igneous rocks.  Subsequent regional metamorphism occurred during the Brazilian-Pan African Orogenies in the late Neoproterozoic (550-650 Ma).  The rock is rich in metamorphic minerals - epidote (= pistachio green), actinolite, tremolite, chlorite, muscovite mica, and biotite mica.  Despite the metamorphism, the original sedimentary structures are preserved - ripple marks are sometimes present.

Stratigraphy: Ipuçaba Formation, middle Pajeú Synthem, Oliveira dos Brejinhos Group, Espinhaço Supergroup, Mesoproterozoic, ~1.6 to 1.7 Ga

Locality: commercial quarry in Bahia State, eastern Brazil
---------------------
Info. synthesized from: 

Arcanjo (2008) - O Grupo Oliveira dos Brejinhos no setor norte da Serra do Espinhaço, com enfase aos hornfelses da Formação Pajeú, Bahia.

Danderfer et al. (2009) - New geochronological constraints on the geological evolution of Espinhaço Basin within the São Francisco Craton - Brazil.  Precambrian Research 170: 116-128.

Siddall (2016) - There's an awful lot of conglomerates in Brazil: 'Monolith & Shadow' revisited.  Geology Today 32: 205-207.

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Taken on: May 31, 2017

Tags:

Verde

Bamboo

Ipuçaba

Ipucaba

Formation

Pajeú

Pajeu

Synthem

Oliveira

dos

Brejinhos

Group

Espinhaço

Espinhaco

Supergroup

Precambrian

Proterozoic

Mesoproterozoic

sandstone

quartzite

epidote

metasandstone

hornfels

metamorphism

Bahia

Brazil « less

Sets appears in: • Green Rocks, Minerals, Fossils • Minerals - Silicates (Epidote) more » • Mesoproterozoic Rocks, Minerals, Fossils • Brazil Rocks, Minerals, Fossils • Quartzite (decorative stones) « less

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