"Metallogeny of arcs, from subduction-related to post-subduction processes"

与大洋岩石圈俯冲有关的岩浆弧具有寻找斑岩型铜钼金和浅成热液金矿的前景。最近，世界上一些地区也发现了俯冲停止后形成的斑岩和浅成热液矿床，这些矿床可能是在碰撞过程中或之后产生的。该研究项目旨在研究在俯冲过程中和俯冲后对斑岩和浅成热液矿床形成的构造和岩浆控制。 这项研究计划要解决的主要问题是：(1)具有成矿潜力的岩浆是如何在弧形环境中形成的？(2)能否确定岩浆丰度的任何化学或矿物学指标？(3)我们能否通过研究弧系暴露的深部地壳根来了解富饶的岩浆形成？(4)俯冲后斑岩和浅成热液系统的出现告诉我们俯冲过程如何影响深层岩石圈？ 这些问题将通过有针对性的实地考察来解决，特别是北美和南美洲的弧形地体，以及土耳其-伊朗-巴基斯坦-西藏的特提斯带。将对收集的样品进行地球化学、同位素和地质年代学分析，以限制富饶的岩浆岩在其区域构造岩浆背景下的时间和演化，并确定控制找矿前景的关键参数。还将开展高压/高温实验工作，以探索俯冲变质岩石圈熔融过程中金属的行为。 这项研究预计将引起加拿大和国际矿产勘探业的兴趣，并将揭示俯冲期间和俯冲后岩石圈深处发生的岩浆过程。

Magmatic arcs related to the subduction of oceanic lithosphere are prospective for porphyry Cu±Mo±Au and epithermal Au deposits. Recently, porphyry and epithermal deposits that formed after subduction ceased have also been recognized in several parts of the world; these deposits may be generated during or after collisional processes. This research program aims to examine the tectonic and magmatic controls on porphyry and epithermal ore deposit formation that operate both during and after subduction. The main questions to be addressed by this research program are: (1) How do magmas with ore-forming potential ("fertile" magmas) form in arc environments?; (2) Can any chemical or mineralogical indicators of magma fertility be identified?; (3) Can we learn anything about fertile magma formation by studying the exposed deep crustal roots of arc systems?; and (4) What does the occurrence of post-subduction porphyry and epithermal systems tell us about the way subduction processes affect the deep lithosphere? These questions will be addressed by targeted fieldwork, with special focus on the arc terranes of North and South America, and the Tethyan belt of Turkey-Iran-Pakistan-Tibet. Geochemical, isotopic, and geochronological analyses will be undertaken on collected samples to constrain the timing and evolution of fertile magmatic suites within their regional tectonomagmatic context, and to identify key parameters that control prospectivity. High pressure/temperature experimental work will also be undertaken to explore the behaviour of metals during melting of subduction-modified lithosphere. This research is expected to be of interest to the Canadian and international mineral exploration industries, and will also shed light on magmatic processes occurring in the deep lithosphere during and after subduction.