No abstract

No abstract

HREE fract. (metam. grt); pos. Eu and Sr anomalies (magm. Plag); neg. HFSE; Nb/Ta fract. high CaTs, Na and Al variations (cpx); Al-rich metam. sp; Mg-rich grt; slight fract. LREE and HREE to the MREE, pos. Eu and Sr anomaly, low HFSE (cpx); pos. Eu anomaly, low HREE (grt). metam. Grt and cpx Graphite pseudomorph after diamond garnet clinopyroxenites (PSD) show a similar band geometry and geochemistry to specific IIIA garnet clinopyroxenites. Modal composition mineralogy consists of:

21Extreme enrichment and post-magmatic hydrothermal mobilization of the rare earth 22 elements (REE), Zr and Nb have been reported for a number of anorogenic peralkaline 23 intrusions, including the world-class REE-Zr-Nb deposit at Strange Lake, Quebec, 24Canada. Establishing lithogeochemical vectors for these types of deposits is a challenging 25 task because the effects of hydrothermal processes on element distribution are poorly 26 known and the relationships of alteration types to mineralization stages have not been 27 well documented. Here, we present results of a detailed mineralogical and geochemical 28 investigation involving a dataset of over 500 mineral and bulk rock analyses of a NE-SW 29 section through the potential ore zone at Strange Lake. Based on these data, we develop a 30 model that explains the role of hydrothermal processes in concentrating metals in 31 peralkaline granitic systems, and identify lithogeochemical vectors for their exploration. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 Gysi, A.P., Williams-Jones, A.E., Collins, P., 2016b. Lithogeochemical Vectors for Hydrothermal Processes in the Strange Lake Peralkaline Granitic REE-Zr-Nb Deposit. and zircon) and Nb-Ti-minerals (i.e., titanite and pyrochlore). 56Lithogeochemical vectors were identified to distinguish between the high 57 temperature acidic alteration (IIIa) using CaO/Na2O (indicator of Ca-metasomatism) and 58

No abstract

The long-term security of geologic carbon storage is critical to its success and public acceptance. Much of the security risk associated with geological carbon storage stems from its buoyancy. Gaseous and supercritical CO 2 are less dense than formation waters, providing a driving force for it to escape back to the surface. This buoyancy can be eliminated by the dissolution of CO 2 into water prior to, or during its injection into the subsurface. The dissolution makes it possible to inject into fractured rocks and further enhance mineral storage of CO 2 especially if injected into silicate rocks rich in divalent metal cations such as basalts and ultra-mafic rocks. We have demonstrated the dissolution of CO 2 into water during its injection into basalt leading to its geologic solubility storage in less than five minutes and potential geologic mineral storage within few years after injection [1][2][3]. The storage potential of CO 2 within basaltic rocks is enormous. All the carbon released from burning of all fossil fuel on Earth, 5000 GtC, can theoretically be stored in basaltic rocks [4].

No abstract

No abstract