Pluton Exhumation in the Precordillera of Northern Chile (17.8°–24.2°S): Implications for the Formation, Enrichment, and Preservation of Porphyry Copper Deposits

Simon I.R. Dahlström*, Frances J. Cooper, Jon Blundy, Simon Tapster, Jaime Cortés Yáñez, Laura A. Evenstar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Hypogene mineralization in porphyry Cu deposits is typically associated with crustal thickening and rapid exhumation, whereas supergene enrichment requires slow exhumation to allow sufficient time for leaching and downward transport of Cu before it is lost to surface erosion. Therefore, spatial and temporal patterns of exhumation within a metallogenic belt can highlight favorable locations for hypogene mineralization, supergene enrichment, and preservation. Here, we determine average pluton exhumation rates along an ~730-km segment of the middle Eocene-early Oligocene metallogenic belt in northern Chile (17.8°–24.2°S). By combining zircon U-Pb geochronology with Al-in-hornblende geobarometry, we pinpoint the time and depth at which each pluton was emplaced and use the age of overlying cover units or supergene minerals to date its arrival at the surface (or near-surface) environment. Uranium-lead zircon ages for 49 samples from plutons and porphyries range from Carboniferous to Eocene (~314–35 Ma). Al-in-hornblende emplacement depths for 19 plutons are ~4–7 km, with one Carboniferous pluton emplaced at ~12 km. Two phases of net exhumation are identified: early Permian-Middle Triassic and middle Eocene-late Oligocene, with an intervening period of net burial. The highest exhumation rates (>0.30 km/m.y.) derive from the second phase, coeval with the Incaic orogeny and the main phase of hypogene mineralization. Present-day preservation of plutons and porphyry Cu deposits required low post-Oligocene average exhumation rates of <~0.01 km/m.y.—favorable for the development of many world-class supergene blankets. However, spatial variability in exhumation and burial across the belt led to poor conditions for supergene development locally: enrichment was hampered in some places by rapid exhumation after hypogene mineralization (e.g., ≥~4 km at El Abra), by burial beneath significant cover (e.g., Ministro Hales, Queen Elizabeth), or, in the Inti region of northernmost Chile, by a combination of the two.

Original languageEnglish
Pages (from-to)1043-1071
Number of pages29
JournalEconomic Geology
Volume117
Issue number5
DOIs
Publication statusPublished - Aug 2022
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geology
  • Geochemistry and Petrology
  • Economic Geology

Fingerprint

Dive into the research topics of 'Pluton Exhumation in the Precordillera of Northern Chile (17.8°–24.2°S): Implications for the Formation, Enrichment, and Preservation of Porphyry Copper Deposits'. Together they form a unique fingerprint.

Cite this