| Quebrada Marquesa Formation | |
|---|---|
| Stratigraphic range: Barremian-Albian | |
| Type | Geological formation |
| Overlies | Arqueros Formation |
| Thickness | 1500 m |
| Lithology | |
| Primary | Porphyritic andesite, tuff, limestone, volcanic sandstone, calcareous sandstone |
| Other | Conglomerate, manganese deposits |
| Location | |
| Coordinates | 24°1′51.70″S 68°11′44.79″W / 24.0310278°S 68.1957750°W / -24.0310278; -68.1957750 |
| Region | Coquimbo Region |
| Country | Chile |
Quebrada Marquesa Formation (Chile) | |
Quebrada Marquesa Formation (Spanish: Formación Quebrada Marquesa) is a geological formation composed of alternations of volcanic and volcaniclastic rock layers and mostly continental (as opposed to marine) sedimanry rocks in inland Coquimbo Region, northern Chile.1 Its does however have a few layers of marine sedimentary rock near its base.1 It overlies the older Arqueros Formation wth which it has some interdigitation.2 Quebrada Marquesa Formation contains economically valuable manganese layers in its upper half.23 The formation has a stratigraphic thickness of about 1500 m.4
References
References
- Aguirre & Mehech 1964, p. 433.
- Aguirre & Mehech 1964, p. 429.
- Aguirre & Mehech 1964, p. 431.
- Oyarzun et al. 1998, p. 549.
- Bibliography
- Aguirre, Luis; Mehech, Sonia (1964). "Stratigraphy and Mineralogy of the Manganese Sedimentary Deposits of Coquimbo Province, Chile". Economic Geology. 59 (3): 428–442. Bibcode:1964EcGeo..59..428A. doi:10.2113/gsecongeo.59.3.428.
- Oyarzun, R.; Ortega, L.; Sierra, J.; Lunar, R.; Oyarzun, J. (1998). "Cu, Mn, and Ag mineralization in the Quebrada Marquesa Quadrangle, Chile: the Talcuna and Arqueros districts". Mineralium Deposita. 33 (6): 547–559. Bibcode:1998MinDe..33..547O. doi:10.1007/s001260050171.