SPATIAL AND GENETIC CONNECTION OF SULPHID ORE DEPOSITS WITH PLAGIOGRANITES IN THE CENTRAL MIRDITA REGION OF ALBANIA, BASED ON THE ISOTOPIC AND TRACE ELEMENTS ANALYSIS DATA

In Central Mirdita Region of Albania there are two Jurassic Ophiolitic Complex Belts: western- and eastern belt.

In Western Belt Ophiolites (MOR-type) of The Central Mirdita there are MORB-lavas of Vulcanite Suite (basalts) Complex (Rubik, Velë) with Sulphides as follow:

- pseudostratiform massive Cu-Fe Sulphide in Vulcanite of pre-ophiolitic Vulcano- Sedimentary Formation(Rubik etc.), δ³⁴S = + 1.1

- small Vein-type of Sulphides (Gjazu -Lumth, etc.) , δ³⁴S =+ 0,8.;.

- disseminations and hirothermalmetsomastites Sulphides in the Volcanic Rocks (Kaçinar- Derven - Stojan).

In Eastern Belt Ophiolites (SSZ-type) there are

a) the Crustal Sequence which consist: of lower Plutonic Unit with layered Gabbronorite, Gabbros (sills or irregular), Quartz Diorite, Plagiogranite, Sheeted Dykes (associated). In lower-middle part of Plutonic Gabbros Massives there are a widespread occurrences of vein- and shtockwork-type Quartz-Cu, Fe sulphide Mineralization, δ³⁴S = + 5,3.

b) Volcanic Complex : Basalts, Andesitebasalts Lavas, Boninite PillowLavas, Keratophyres, Rhyolite extrusives.( IAT–Boninitic volcanic): the Qafë Mali- Munellë- Spaç-Përlati Sulphids Belt with several genetic types of Sulphides (δ³⁴S = + 3,5 deri + 5,3 ): Vein- and Shtochwork-type, Vein-type and desimminated Hydrothemal Metasomatic (Spaç etc.), massive Cu-Fe Sulphides (Qafe Bari-Munella, Gurth Spaç, Perlati).

The δ³⁴S ratios of sulphides range are from +0.8 to +5.3 indicating the magmatogenic Origin of Sulfur in these Sulphid Deposits.

The nearest δ³⁴S and Trace Elements of Sulphid Mineralization of Sulphid Ore Deposits in the “axial’ part of the Central Mirdita Ophiolites Complex suggests the same fluid source. In the Plagiogranites (which are considered “re-melted hybrid” rocks) the sulphides have δ³⁴S ratios, being identical to all these deposits and are controlled by the same Structural System (Riedel-Shear Structures, λ-Lambbda-, ξ-Ksi-, S, Vortex and Wrench, Structures) leads to idea that the plagiogranitic intrusions were the main hydrothermal fluids source for the Qafë Mali- Munellë- Spaç- Përlati Sulphids Belt. Plagiogranites “interrupt” all types of igneous rocks and are the part of the Hydrothermal Ore Forming System from “an immiscible Sulphide or Oxide Magma.