Editing Platinum group (section)

==Occurrence== 
Generally, [[ultramafic rock|ultramafic]] and [[mafic]] [[igneous rock]]s have relatively high, and [[granite]]s low, PGE trace content. Geochemically anomalous traces occur predominantly in chromian [[spinel]]s and sulfides. Mafic and ultramafic igneous rocks host practically all primary PGM ore of the world. Mafic [[layered intrusion]]s, including the [[Bushveld Complex]], outweigh by far all other geological settings of platinum deposits.<ref name="buchanan03">{{cite journal |last1=Buchanan |first1=D. L. |editor1-last=Cabri |editor1-first=L. J. |title=Geology of Platinum Group Elements |journal=CIM Special Volume 54: The Geology, Geochemistry, Mineralogy and Mineral Beneficiation of Platinum-group Elements |date=2002 |url=https://www.technology.matthey.com/article/47/2/59-60/ |publisher=Canadian Institute of Mining, Metallurgy and Petroleum |location=Montréal}}</ref><ref name="ReferenceA">{{cite book |first=Walter L. |last=Pohl |title=Economic Geology : Principles and Practice |location=Oxford |publisher=Wiley-Blackwell |year=2011 |isbn=978-1-4443-3662-7 }}</ref><ref name="zereini15">{{cite book |last1=Zereini |first1=Fathi |last2=Wiseman |first2=Clare L.S. |title=Platinum Metals in the Environment |date=2015 |publisher=Springer Professional |location=Berlin |url=https://www.springerprofessional.de/platinum-metals-in-the-environment/4376278}}</ref><ref name="mungall08">{{cite journal |title=Ore Deposits of the Platinum-Group Elements |year=2008|doi=10.2113/GSELEMENTS.4.4.253|last1=Mungall|first1=J. E.|last2=Naldrett|first2=A. J.|journal=Elements|volume=4|issue=4|pages=253–258|bibcode=2008Eleme...4..253M }}</ref> Other economically significant PGE deposits include mafic intrusions related to [[flood basalt]]s, and ultramafic complexes of the Alaska, Urals type.<ref name="ReferenceA" />{{rp|230}}