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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Origins and evolution of two types of Late Triassic granitic magmas in the Caolong-Xiangkariwa area of central-eastern Songpan-Ganze terrane, northern Tibet: Implications for pegmatite lithium mineralization Available to Purchase
Large-scale rare-metal pegmatite deposit formation driven by supercontinent assembly Available to Purchase
Magma migration and surface uplift in Pamir–western Tibet driven by deep lithospheric dynamics Available to Purchase
The efficiency of copper extraction from magma bodies: Implications for mineralization potential and fluid-silicate melt partitioning of copper Available to Purchase
Subduction erosion and crustal material recycling indicated by adakites in central Tibet Available to Purchase
Extraction of high-silica granites from an upper crustal magma reservoir: Insights from the Narusongduo magmatic system, Gangdese arc Available to Purchase
Syn-collisional magmatic record of Indian steep subduction by 50 Ma Available to Purchase
First identification of postcollisional A-type magmatism in the Himalayan-Tibetan orogen Available to Purchase
Postcollisional delamination and partial melting of enriched lithospheric mantle: Evidence from Oligocene (ca. 30 Ma) potassium-rich lavas in the Gemuchaka area of the central Qiangtang Block, Tibet Available to Purchase
Komatiite: Nicholas Arndt, C. Michael Lesher, and Steve J. Barnes. 488 Pp. Cambridge University Press, New York. 2008. ISBN: 978-0521874-748. Price CDN$150.00. Available to Purchase
Partial Melting of Thickened or Delaminated Lower Crust in the Middle of Eastern China: Implications for Cu-Au Mineralization Available to Purchase
Formation of Archean continental lithospheric roots: The role of mantle plumes Available to Purchase
Lode Gold Deposits and Archean Mantle Plume–Island Arc Interaction, Abitibi Subprovince, Canada Available to Purchase
Paleoproterozoic boninites in an ophiolite-like setting, Trans-Hudson orogen, Canada Available to Purchase
A 2.7 Ga Komatiite, Low Ti Tholeiite, Arc Tholeiite Transition, and Inferred Proto-Arc Geodynamic Setting of the Kidd Creek Deposit: Evidence from Precise Trace Element Data Available to Purchase
Abstract A high-precision trace element study of ultramafic, mafic, and felsic rocks of the Kidd Creek Volcanic Complex reveals abundant compositional variety, which in turn indicates a previously unsuspected complexity of geodynamic processes. The stratigraphically lowest part of the Kidd Creek Volcanic Complex comprises mantle plume-related komatiites and komatiitic basalts. The komatiites exhibit light rare earth element (REE) depletion, near-chondritic Al 2 O 3 /TiO 2 ratios, and other features characteristic of Munro-type komatiites. A suite of low Ti tholeiitic basalt flows (TiO 2 typically <0.4 wt %; Al 2 O 3 = 11–22 wt %, MgO = 12–18 wt % in primitive examples), not previously documented in Archean terranes, is intercalated with the komatiites and rhyolitic sequences in the Kidd Creek Volcanic Complex. The low Ti tholei-ites are characterized by very high Al 2 O 3 /TiO 2 ratios (>50), high compatible element abundances (Ni = 300–500 ppm; Cr = 600–1,200 ppm), low incompatible element abundances, low Zr/Y ratios (1.3–2.0), and depleted light REE combined with fractionated heavy rare earth element (REE) ratios (La/Sm N = 0.4–0.7; Gd/Yb N = 0.4–0.5). The low Ti tholeiites and coexisting rhyolites are overlain by a zone of basalts with diverse trace element compositions, ranging from midocean ridge basalt (MORB)-like to arclike. Above the diverse zone, trace element compositions are more uniform over short stratigraphic intervals and two suites of arc-related basalts are identified. The lowermost suite consists of aphyric, primitive arc tholeiites with relatively high Ti contents (TiO 2 = 1.5–2.7 wt %), moderate light REE enrichment (La/Sm N = 1.2–1.5), unfrac-tionated heavy REE, Zr/Y ratios greater than primitive mantle (3.0–3.5), and small negative Nb anomalies (Nb/Nb* = 0.60–0.75). The upper portion of the Kidd Creek Volcanic Complex consists of weakly feldspar-phyric evolved arc tholeiites which are distinguished from the primitive arc basalts by greater LREE enrichment and Nb depletion (La/Sm N = 1.5–2.1; Nb/Nb* = 0.3–0.7) and systematic depletions of Zr and Hf (Zr/Zr* = 0.61; Hf/Hf* = 0.58). Petrographic and geochemical characteristics of the low Ti suite closely resemble post- Archean tholei-ites found in a restricted association with boninites and proto-arcs in extensional settings, involving high-temperature melting of depleted refractory mantle. Combined with the progressively more pronounced arc-type signatures in basalts upward in the Kidd Creek Volcanic Complex, the stratigraphic location of the low Ti tholeiites provides strong evidence that these Archean examples reflect 2.7 Ga arc initiation processes, similar to those now envisioned for Phanerozoic proto-arcs. Geochronological data and stratigraphic evidence indicate that plume activity did not cease with the onset of arc magmatism in the Kidd Creek Volcanic Complex. Instead, interaction of the plume with a trench system probably resulted in plate rearrangements and the local development of a new arc in the Kidd Creek Volcanic Complex. Accordingly, the Kidd Creek deposit is the product of an extensional sub-duction zone geodynamic setting.