Matureland of Northern Chile and Its Relationship to Ore Deposits

Segerstrom, Kenneth

doi:10.1130/0016-7606(1963)74[513:moncai]2.0.co;2

Cited by 16 publications

(11 citation statements)

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“…They also obtained late Miocene dates on some supergene and exotic copper deposits, indicating that these processes continued under favourable conditions. Rather than the Atacama landscape being a bmaturelandQ (Segerstrom, 1963), based on Davis's (1899) concepts of old, mature, and youthful landscapes, it is better described as a metastable landscape. Supergene processes are quiescent in the regolith unless the stability is perturbed.…”

Section: Implications For Supergene Mineralisationmentioning

confidence: 97%

“…Superimposed on almost all of these deposits is supergene mineralization. Several authors, beginning with Segerstrom (1963) and Mortimer (1973), Bouzari and Clark (2002) have speculated on the existence of a bsupergene time windowQ in the Atacama Desert. These authors suggest that there was a specific time interval (Segerstrom: Middle to Late Tertiary, Mortimer: Late Eocene and Late Miocene, Bouzari and Clark: Oligocene to Miocene) that was particularly favourable for the development of supergene mineralization.…”

Section: Implications For Supergene Mineralisationmentioning

confidence: 99%

“…The presence of these secondary mineralization zones is a reflection of the history of groundwater, tectonics, landscape, and climate of the Atacama Mote and Brimhall, 1997;Mote et al, 2001). The supergene zones date mostly between the Early Oligocene and Mid Miocene, apparently defining a bsupergene time windowQ (Segerstrom, 1963;Mortimer, 1973;Sillitoe and McKee, 1996). The extreme aridity of the climate and unusual mineralogy of the regolith is also of consider- able interest because of its value as an analogue to the Martian surface (McKay et al, 2003).…”

Section: Introductionmentioning

confidence: 98%

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Antiquity of aridity in the Chilean Atacama Desert

2006

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Section: Implications For Supergene Mineralisationmentioning

confidence: 97%

Section: Implications For Supergene Mineralisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Antiquity of aridity in the Chilean Atacama Desert

2006

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“…Conversely, Hartley and Rice () proposed that the influence of regional pediplain formation on SCM is not well established, mainly due to the lack of landform ages. To tackle this issue, we focused on the Centinela District (CD) in northern Chile (Figure a,b), where most of the world‐class SCMs are hosted beneath pediplains (Mortimer, ; Segerstrom, ).…”

Section: Introductionmentioning

confidence: 99%

Exhumation history and timing of supergene copper mineralisation in an arid climate: New thermochronological data from the Centinela District, Atacama, Chile

et al. 2017

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Supergene copper mineralisation (SCM) processes occur during the unroofing of porphyry copper deposits. However, the geomorphological stage during which the main mineralisation occurs is still under debate. Here, we present 24 new thermochronological data from Cenozoic intrusives and compare them with the evolution of supergene mineralisation from the Centinela Mining District in the Atacama Desert. Our results indicate a two-step cooling path: a rapid Late Eocene exhumation followed by a slow denudation. Previously published supergene mineralisation ages cluster after the main Upper Oligocene exhumation period. Ours is the first study that establishes the relationship between exhumation and supergene processes on the scale of a single mining district. It confirms that SCM took place during pediplanation, likely a required condition for efficient SCM under arid climatic conditions, in contrast to wet tropical environments where SCM occurs during rapid relief growth but has limited preservation potential.

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“…Middle Tertiary (Segerstrom 1963) gravels, now exposed as terraces, overlie unconformably the older units (Fig. 2).…”

Section: Geology Of the Elisa De Bordos Districtmentioning

confidence: 97%