Abstract
A stratabound gold and platinum metal mineralisation has been located in the Tertiary Skaergaard intrusion of the Kangerdlugssuaq area 68°N in East Greenland. The mineralisation is located in the upper part of the Middle Zone (MZ) of the layered gabbros and appears continuous over c. 40 km2. The mineralisation is 2–5 m thick with gold concentrations up to 5.6 g/t, Pd up to 3.5 g/t and Pt up to 1.5 g/t. Major and trace element distributions indicate that the gold is concentrated in the less mafic layers in the mineralised horizon. It is also concluded that previously reported TiO2 contents of the gabbros and the TiO2 enrichment in the evolving liquids of the intrusion have been underestimated by a factor of 2–3.
Highlights
A stratabound gold and platinum metal mineralisation has been located in the Tertiary Skaergaard intrusion of the Kangerdlugssuaq area 68"N in East Greenland
The Skaergaard intrusion is an oval gabbroic body of 55 kmz which can be divided into three main units: the Marginal Border Group (MBG), the Upper Border Group (UBG) and the Layered Series (LS)
The MBG and the UBG soIidified from the contacts inwards whiIe the LS solidified from the bottom and upwards by accumulation and/or growth of minerals at the floor of the magma chamber. an the basis of the presence or absence of olivine as a cumulus phase the exposed Layered Series is divided into a Lower Zone (LZ), Middle Zone (MZ) and Upper Zone (UZ)
Summary
The Skaergaard intrusion (fig. 1; for location see fig. 1 in Nielsen, 1990) is an oval gabbroic body of 55 kmz which can be divided into three main units: the Marginal Border Group (MBG), the Upper Border Group (UBG) and the Layered Series (LS). 1 in Nielsen, 1990) is an oval gabbroic body of 55 kmz which can be divided into three main units: the Marginal Border Group (MBG), the Upper Border Group (UBG) and the Layered Series (LS). The MBG and the UBG soIidified from the contacts inwards whiIe the LS solidified from the bottom and upwards by accumulation and/or growth of minerals at the floor of the magma chamber. Ever since the first descriptions by Wager & Deer (1939) the systematic cryptic variation in mineral compositions up through the LS has been taken as evidence for the crystallisation of the gabbros from a single pulse of tholeiitic magma. A tull description of the intrusion can be found in Wager & Brown (1968)
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