Evidence for Early LREE-enriched Mantle Source Regions: Diverse Magmas from the c. 3{middle dot}0 Ga Mallina Basin, Pilbara Craton, NW Australia |
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| Authors: | SMITHIES R H; CHAMPION D C; SUN S-S |
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| Institution: | 1 GEOLOGICAL SURVEY OF WESTERN AUSTRALIA, 100 PLAIN STREET, EAST PERTH, WA, 6004, AUSTRALIA
2 GEOSCIENCE AUSTRALIA, GPO BOX 378, CANBERRA, ACT, 2601, AUSTRALIA |
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| Abstract: | The c. 2·97–2·95 Ga magmatic history ofthe Mallina Basin, in the Pilbara Craton of NW Australia, includeswhat is perhaps the most lithologically diverse magmatism ofany similar-sized Archaean terrain, and is unusual for similar-sizedterrains of any age. The magmatism includes light rare earthelement (LREE)-rich basaltic rocks, LREE-rich gabbros and rockswith boninite-like compositions (collectively the ‘Mallinamafic suite’), and high-Mg diorites (sanukitoids). TheMallina mafic suite is characterized by high primitive mantlenormalized (La/Nb)PM (>3) and (La/Yb)PM (>2), and non-radiogenicNd-isotopic compositions ( |
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| Keywords: | : Archaean crustal evolution enriched mantle mafic magmas boninite sanukitoid subduction |
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