CnHCAHHE HA B'bJlfAPCKOTO fEOJ10fJ1liECKO .LI.PY)KECTBO, r.oJl.XLII, KH. I , 1981

REVIEW OF THE BULGARIAN GEOLOGICAL SOC IETY, vol. XLII, part I, 1981

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T. Marinov, I . Bairaktarov - Petrologic Characterization of the Subvolcanic Dike Rocks from the Zidarovo Central Magmatic Complex. The s ubvolcanic dike rocks are t he main compo-nents of the Zidarovo central magmatic complex. They are represen ted by two di ke series : t he fi rst was formed parallel to the volcanic activity and the second- towards the end of the volcani c ac tivity or immediate ly after its termination. I n time they preceed the Zi-darovo intr us ive. After the classification and nomenclature of Streckeisen the first series comprises leucite phonotephrites, latibasa lts and mela latian desites and the second - le-ucile basanites , leucite t ephr ites and phonotephrites, latibasalts, melalatiandesites, quartz latiandes ites.

The order of fo rmati on and the composit ion of both subvolcanic dike series s how t hat they are a r esult of homodromous differentiat ion of an in i t ial alkaline olivi ne-basalt magma with potash trend, more completely developped in the second series. The nearly analogous chemism and phenocomfosition of the corresponding members of bot h series suggests a two-fold intrusion of initi a a lkaline basalt magma and following differentiation in s imilar condi ti ons . The chemi cal features of the rocks from the secon d series, for which more data are available , in dica te th at the differen tiation developped from s trongl y unsa turated to sa turated an d s li ghtly oversa t urated with res pes t to Si02 rocks with para lle l decrease of Mg and Fe, gradua l increase of alkalis and decrease of the r a tio K20 / Na20. I n this r egime the lack of water-containing mi nerals in the late members of the dike series, in the presence of widespread amygdule structures, is a reason to s uggest t hat during crystalliza tion t he mag ma chamber was connected with the surface.

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HoMHHHpaHero Ha cKaJIHTe e Hanpa.BeHo no KJiacH~HKaUHHTa na S t r e-c k e i s en (1967, 1979).

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MecronxolK.Ilt RHe : 3- 111 I km ceaepHo or c. 3R.Ilapoao; 239, 2391 - MttTROCTTI KaaapiTa; 501 - HI 200 m IOlKRO or c. l13Bop; 510''• 510" - HI 300 m e~aepou!IIAHO or ap. KlpTI.IIKyc; 902 - •• 500 m ceaepoHsroqHo o r ap. KI PTII!xyc a CucKa pe11a; 903, 9038 - Ha 1300 m JOroasro•Ho or c . H,.op; 1143 Ha 750 m cesep-ceaepoHs-roqllo or ap. KapTanKyc; 2032 - aa 900 m ceaepoaaro'IHO or c. Hsaop; 20898 - Hl 1200 m ceaepHo or c. Kpyweaeu a Cucu ptKa

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I I Or6Ab24An7o An4Ab100r86 Di - 13,16 4,58 11,03 2,29 0,43 0,65 -903• 33,36 0,70 33,75

I -! I I OrsAb40An52 An6Ab2sOr68 Di-auq I

I

0,63 0,88 4,72 9,39 - I - - 1,72 I

1143 49,52 22,67 10,03 l --

I I 2032 Or9Ab4gAn12 An5Ab3,0rso Di-auq 2,48 - - - 1,75 0,53 0,72 2,91 41,81 27,4 1 18,03

--- ---2089a I Or8Abar,An56 I An6Ab240r7o Auq. I 3,58 0,68 I - - I 2,36 I 0,42 I 1,15 -41 ,81 15,48 34,49

3 - JleBUHTOB

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nocoqemne no-rop e OC06eHOCTH B H3MeHeHHeTO Ha CbCTaBa Ha nocJie)l.O-BaTeJIHHTe 'lJieHOBe Ha ,D:aHKOBaTa cepHH xapaKTepH3HpaT XOMO)l.pOMHa Teij,D:eHU.HH Ha Jl.H¢epeHU.HaU.HH Ha nbpBH'lHa KaJIHeBO·aJIKaJIHa OJIHBHH-6a3aJITOBa CepHH. Mo.>Ke c ,n:ocraTb'lHO ocHoBaHHe ,n:a ce npe,n:noJio.>KH, qe cbcraBbT Ha H3XO,n:Hara MarMa npH6JIH3HTeJIHO CbOTBeTCTByBa Ha JieBU.HTOBHTe 6a3aHHTH, KOHTO Ca nbpBH B pe,n:a Ha BHe)l.pHBaHe, H no CbCTaB H CTeneH Ha KpHCTaJIH3aU.HH, H3pa3eHa C HH,D:eKCa Ha K y H 0 (1966), KOHTO BapHpa OT 33,1 ,11:0 41,1, CTOHT 6JIH30 )l.O CbCTa· Ba Ha nbpBH'lHHTe MaHTHHHH MafMIL

Berne aeqe or6eJIH3aHo, qe no CbCTaB cKaJIHTe or nbpsara ,n:aiiKoBa cepHH (JieBU.HTOBH Te¢pHTH, ¢oHOTe¢pHTH H TpaxH6a3aJITH) Ca CXO,D:HH CbC CbOTBeT-CTByBalll.HTe HM 'lJieHOBe OT BTOpaTa cepHH. CbC CHrypHH ,n:aHHH 3a OTCbCTBHeTO Ha JieBU.HTOBH 6a3aHHTH B nbpsara cepHH He pa3nOJiaraMe. Ta3H nosropHeMocr B CbCTasa Ha .n:sere ,n:aiiKOBH cepHH Mo.>Ke ,n:a ce TbJIKyaa Karo pa3yJirar Ha .n.sy-KparHo nOCTbnBaHe B MarMeHaTa KaMepa Ha 6JIH3Ka no CbCTaB nbpBH'lHa MarMa C nOcJie,D:Balll.a Jl.H¢epeHU.HaU.HH B aHaJIOfHtiHH reOJIO.>KKH YCJIOBHH.

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K o n T e B - .li. a o p H H K o B B. C., A. A. 5I p o ill e B c K H H. 1970. 3KcnepuMeH-raJJbHOe ~IQ,ll.eJJHpOBaHHe pHTMH4eCKOH KpHCTaJIJIH3al.lHH B CHCTeMe ITHpOKCeH-nJi afHOKJJa3 B CBSI3H C npOHCXO>K,ll.eHHeM pHTMH4eCKII paCCJIOeHHbiX Maf MaTH4eCKHX TeJJ. -feOXUMUR., 6, 710-720.

K y H o, X. 1966. lJacTOTHoe pacnpe.u.eneHHe THITOB nopo.u. s oKeaHH4eCKH X, oporei!HbiX H KpaToreHHbiX syJIKaHH4eCKHX accouHal.lHSI X. Cax. KH H H, CO AH CCCP, 3-9.

M a p H H o s a- lJ H n 4 a K o s a, CT. 1956. TipHHoc K'bM ne-rporpaKa nJJaHHHa. - roa. Ha Yffl03H, 7, 349-394.

H a 4 e s, l1 B. 1953. Bp'b3Ka Me>K.U.Y MarMaTH3Ma H py.u.oo6pa3yBaHe-ro s Me>K.U.HHHHTe 3eMH Ha BypraCKO-CTpaH,li.>KaHCKaTa o6JiaCT. - MuHHO aeAO, 12, 733- 74 1.

p a ill K 0 B, P., l1 B. B a H p a K T a p 0 B, n. n 0 n 0 B, T. M a p H H 0 B, Jl. H a