Volcanic succession of the Borovnik Member (Mohorje Formation), Bloke Plateau area, Central Slovenia

Volcanic succession of the Borovnik Member (Mohorje Formation), Bloke Plateau area, Central Slovenia

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A 75 m thick volcanic succession of the Borovnik Member, Mohorje Formation in the Bloke Plateau area consistsof dacitic and rhyolitic rocks Spill Mop Kits deposited in a shallow-marine environment.Volcanic activity begun with lavaflows that underwent extensive disintegration, autobrecciation and mixing with the underlying unconsolidated fine-grained clastic sediments producing dacite/rhyolite-siltstone peperites.Peperites are very rich in fractured plagioclase phenocrysts, and owing to the incorporation of clastic material, they are commonly depleted in silica.The overlying fining-upward pyroclastic sequence is monotonous.

Basal parts mainly consist of coarse-grained vitric tuffs that may contain some smaller pumice lapilli.The overlying volcaniclastics are fine-grained vitric tuffs,and in the uppermost parts of the sequence, they are Car Lighter Power Socket interbedded with cherts.The study confirms the existence of primary volcaniclastic succession in the Bloke Plateau area and excludes its epiclastic or reworked origin.