Associated with the sediments are ophiolites and other basic intrusions and volcanics.
Hoeck V., Koller Anf F. 1999, 'Mesozoic Metamorphic evolution of the Tauern Window', Acta Montanistica Slovacahttp://actamont.tuke.sk/pdf/1999/n2/8hoeckakoller.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Petrochemical peculiarities of volcanics vary considerably across the strike of orogenic belts.
Anatoly M. Kurchavov 2018, 'Acid volcanism of various geotectonic situations (on the example of orogenic volcanicbelts in Asia)', Литосфераhttps://test.lithosphere.ru/jour/article/view/222. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Araí volcanics are bimodal, with basalts and dacites/rhyolites interlayered with continental sediments.
MÁRCIO M. PIMENTEL, NILSON F. BOTELHO 2001, 'Sr and Nd isotopic characteristics of 1.77-1.58 Ga rift-related granites and volcanicsof the Goiás tin province, central Brazil', Anais da Academia Brasileira de Ciênciashttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200010. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The last phase of pyrite crystallization appears as fine skeletal grains mostly attached to sericite alteration of altered volcanics.
Abdelhalim S Mahmoud, Viktor V Dyakonov, Maher I Dawoud, Alexander E Kotelnikov 2018, 'Mineral composition, textures and gold habit of the Hamama mineralizations (CentralEastern Desert of Egypt)', RUDN Journal of Engineering Researcheshttp://journals.rudn.ru/engineering-researches/article/viewFile/20604/16673. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Over the volcanics and separated from them by an unconformity there are about 3600 meters of sedimentary deposits.
F. A. AFSHAR 1965, 'Geology of Minaeh district of Northwestern Iran', Bulletin of the Mineral Research and Explorationhttp://dergipark.gov.tr/bulletinofmre/issue/3890/51946?publisher=mta. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
The heat-flow from the volcanic intrusions and hydrothermal activity related to the volcanics modified the texture of authigenic minerals.
Wolela Ahmed 2002, 'Effects of heat-flow and hydrothermal fluids from volcanic intrusions on authigenicmineralization in sandstone formations', Bulletin of the Chemical Society of Ethiopiahttp://www.ajol.info/index.php/bcse/article/view/20947. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Iricoumé volcanics consist of porphyritic trachyte to rhyolite, associated to crystal-rich ignimbrites and co-ignimbritic fall tuffs and surges.
Ronaldo Pierosan, Evandro F. Lima, Lauro V.S. Nardi, Cristina P. de Campos, ArturC. Bastos Neto, José M.T.M. Ferron, Maurício Prado 2011, 'Paleoproterozoic (~1.88Ga) felsic volcanism of the Iricoumé Group in the Pitinga MiningDistrict area, Amazonian Craton, Brazil: insights in ancient volcanic processes fromfield and petrologic data', Anais da Academia Brasileira de Ciênciashttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300012. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)