RT Journal Article
T1 Palaeoenvironmental implications of aluminium phosphate-sulphate minerals inEarly–Middle Triassic continental sediments, SE Iberian Range (Spain)
A1 Galán Abellán, Ana Belén
A1 Barrenechea, José F.
A1 Benito Moreno, María Isabel
A1 Horra Del Barco, Raúl De La
A1 Luque Del Villar, Francisco Javier
A1 Alonso Azcárate, Jacinto
A1 Arche, Alfredo
A1 López Gómez, José
A1 Lago San José, Marceliano
AB The presence of Sr-rich aluminium-phosphate sulphate (APS) minerals in continental sedimentary rocks from the Cañizar and Eslida Formations along the eastern part of the Iberian Range (Spain) is considered as evidence of acidic and oxidising conditions during Early–Middle Triassic times. The formation of APS minerals occurred shortly after sedimentation, in early diagenetic stages, prior to the compaction of the sediments and most probably was related to the circulation of acidic meteoric waters. Such conditions might result from a sustained, damaged environment or from multiple environmental crises, but would have delayed the recovery of life after the end-Palaeozoic mass extinction. APSminerals occur as small disseminated and idiomorphic pseudo-cubic crystals (0.5 to 6 μmlong) or as massive and polycrystalline aggregates replacing fragments of fine- rainedmetamorphic rocks (mainlymetapelites). Textural data indicate that the formation of the APS minerals predated the quartz and illite cements, and that they resulted from the destabilisation of pre-existing minerals, as evidenced by the replacement of slate fragments by APSminerals and hematite and by the close association of the disseminated APS crystals and kaolinitewith altered detrital mica plates. Electronmicroprobe analyses and X-ray diffraction study of the APSminerals indicate a rather homogeneous composition in different parts of the basin, corresponding to solid solutions among woodhouseite, svanbergite, crandallite and goyazite. The sources of strontium in the APS minerals remain unclear. Phosphorous was primarily supplied by dissolution of detrital phosphates under acidic conditions, and sulphur derives from the weathering of pyrite.
PB Elsevier
SN 0037-0738
YR 2013
FD 2013
LK https://hdl.handle.net/20.500.14352/34458
UL https://hdl.handle.net/20.500.14352/34458
LA eng
NO Ministerio de Ciencia e Innovación (MICINN)
NO Geologisches Institut, Bonn University, Germany
DS Docta Complutense
RD 18 abr 2025