- 1Geological Institute, Academy of Sciences, Moscow, Russian Federation (a-romanko@ya.ru)
- 2Baku State University, Baku, Azerbaijan (inazim17@yahoo.com)
- 3University of Isfahan, Isfahan, Iran (mehrdad.hei@gmail.com)
- 4Satrap Resources, Perth, Australia (bahman.rashidi@hotmail.com)
- 5Ministry of Geology, Dushanbe, Tajikistan (mmimal957@gmail.com)
- 6Institute of geology of ore deposits, Academy of Sciences, Moscow, Russian Federation (viken@igem.ru)
We present some data on Cenozoic (KZ) intraplate rocks in Baluchestan and Sistan, East Iran received by a group led by known regional trio: A. Hushmanzadeh, M.A.A. Nogol Sadate, and E. Romanko.
Some important features on intraplate and subduction-related rocks are as follows:
Rocks are mainly K-Na, middle K2O subalkaline (mainly) and alkaline ones, not very High-Ti, 87Sr/86Sr (ISr) = 0.7039+- 2 (trachyAndesite) and 0.7049+- 3 (trachyBasalt) alongside with 0.7049 of 'vulcanite' (Camp & Griffis, 1982), LREE-enrichment with a high LREE/HREE (La - more than 32 ppm), and a characteristical Eu/Eu* more than 1.1; up to high = 1/3 wt% CaO and up to a high=0.45% of Sr in basic trachyandesites (while Quaternary carbonatites are ca. 200 km to the east, Hanneshin, Afghanistan), complex correlation of some characteristical elements; then-High-Ti (rhutile, Ti-hornblende) and High-Ca phases (clinocoizite, also, Ca-rich ceolite - vayrakite is proposed), replacement of primary minerals due to a fairly strong rock-fluid interaction. North-East (submeridianal) tectonic-magmatic +- metallogenic (economic regional porphyry Cu-Au+-Mo; Pb, Zn, Au-Ag and fairly poor Ag, PGE, As, Hg, Bi etc. - e.x., Anarak known deposits in Central Iran associated with Pg (mainly Pg2) subalkaline volcanites (E. Romanko et al., 1984) ) ZONING related to known subduction of Arabian plate, e.x.: subduction-related (1) - intraplate (2) rocks:
1: Eocene shoshonites etc. - Paleocene-Oligocene calc-alkaline intrusives - Miocene-Recent calc-alkaline volcanic (-plutonic) rocks
2: Paleogene? (Lut block) - Neogene intraplate subalkaline - alkaline rocks - Quaternary Afghanistan carbonatites etc. Alpine compression in subduction depth up to 200 km in Central Iran, at least, partly compensated, as proposed, by contemporaneous / younger Pg?-N-Q intraplate magmatism of Iran - Afghanistan - SouthEast Pamir (Pg-N?) and maybe Saudi Arabia carbonatites etc.
This work was made due to the State program of the Geological Institute RAS.
How to cite: Romanko, A., Imamverdiyev, N., Heidari, M., Rashidi, B., Malykh, M., Vikentev, I., and Poleshchuk, A.: Intraplate Ca-rich and Ca-usual igneous rocks in Baluchestan, Iran associated with real carbonatites of Afghanistan, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-14434, https://doi.org/10.5194/egusphere-egu25-14434, 2025.
