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TP CH PHT TRIN KH&CN, TP 12, S 10 - 2009

Bn quyn thuc HQG-HCM Trang 103

C IM KHONG HA VNG KHU VC SUI LINH SNG M V TRIN VNG

Nguyn Kim HongTrng i hc Khoa hc T nhin,QG-HCM

(Bi nhn ngy 08 thng 01 nm 2009, hon chnh sa cha ngy 27 thng 07 nm 2009)

TM TT: Khu vc Sui LinhSng M thuc vng qung Vnh An, pha ty nami Lt. Khong ha vng phn b ch yu trong granitoid thuc phc h nh Qun; thn trongi tip xc vi cc trm tch lc nguyn-carbonat tui Jura thuc 2 h tng kRng v M . Cc vy quanh b bin i nhit dch mnh m l sericit ha, thch anhha, clorit ha v epidot ha. Thn qung dng mch, i mch, theo cc phng khc nhau:ch yu l ng bc-ty nam v ty bc-ng nam; th yu l kinh tuyn v v tuyn.Chng lin quan vi t gy chnh ng bc-ty nam. Khong vt qung 520%, ch yupyrit, arsenopyrit, galena, sphalerit, chalcopyrit, vng t sinh v electrum.Khong ha cngun gc nhit dch nhit trung bnh-thp(1252700C) lin quan n granitoid vi-kimhnh thnh trong cung magma ra lc a kiu ng c vo Mesozoi mun, thuc kiu mvng-thch anh-sulphur dng mch vi 2 kiu khong: vng thch anhpyrit arsenopyrit vvng-thch anh-sulphura kim; y cng l 2 giai on to sn phm. Ch b bc mn nphn trn ca i gia qung nn khong ha vng c trin vng vi quy m m khong nh.Vi c im khong ha trn, im vng khu vc ny c tim nng, cn c tip tc quantm nghin cu.

T kha: Sui Linh, khong ha vng, kiu m, kiu khong, vng thch anh sulphurdng mch, vng thch anhpyrit arsenopyrit, vng-thch anh-sulphura kim.

Khu vc Sui Linh Sng M thuc vng qung Vnh An, pha ty nam i sinhkhong Lt; gm 2 vng lin k: vng Sui Linh (pha ng), thuc x Hiu Lim, huynVnh Cu, tnh ng Nai v vng Sng M (pha ty) thuc x Tam Lp, huyn Ph Gio,tnh Bnh Dng.

Sau 1975, cc thnh to a cht c xc lp n nay vn th hin tnh ng n nh: lotBn n (Nguyn Xun Bao v nnk, 1980), phc h nh Qun (Hunh Trung, Nguyn XunBao, 1979). Sau , lot Bn n c tch thnh ip Dray Linh (Nguyn c Thng vnnk, 1986) hoc h tng Dray Linh (Ma Cng C v nnk, 1987); v sau, c tch thnh cch tng: M v k Rng (Ma Cng C v nnk, 2007).

T 1985, vng gc c pht hin v khai thc trong i tip xc granitoid vi trmtch lc nguyn-carbonat tui Jura vng Sui Linh; n 1994, Lin on a cht 6, tmkim chi tit ha. Sau , Cty Donavik v Cty Khong sn ng Nai khai thc th nghim khu Tng Kho (1994-1996). Cng ty a cht-Khong sn 6 tm kim nh gi im vngSui Linh vo 1995-1998. Tc gi v nnk (1998, 2001) nghin cu b sung xc nh kiu vngun gc khong ha vng y. im vng Sng M c on a cht I pht hin v

iu tra chi tit vo 2008.1. C IM A CHT

1.1. c im a cht khu vc

1.1.1. a tng1.H tng k Krng (J1k): Cc phn b rng ri pha ty khu vc. Thnh phn

gm: bt kt, st kt xen t ct kt cha vi mu xm en, cha phong ph ho thch bc


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Science & Technology Development, Vol 12, No.10- 2009

Trang 104 Bn quyn thuc HQG-HCM

Sinemuri v Toaxi. Cc b bin i: sericit ho, sng ho mnh; i ni b p phin mnh,b c nt, dp v theo phng ng bcty nam; ty bcng nam v kinh tuyn. Cc cm dc (30700) v 2 pha, to np li. Ranh gii trn chuyn tip ln cc h tng M (J2m). B dy khong 450500m.

2. H tng M (J2m) : Cc l pha ng khu vc. Thnh phn gm: st kt,

phin st xen t lp bt kt, st bt kt, cha nhiu vt cht hu c

, cha t vi, mu xm

en,phn lp trung bnh n dy. Cc b bin i: sericit ha, sng ho v b dp v nt n tonhiu h khe nt khc nhau. cm dc 30-650 v pha ng. B dy khong 400 m.

3. H tng B Miu (N22bm): Cc trm tch aluvi l kh rng ri trn cc di i g pha

ty nam, ph ln b mt phong ha bc mn ca trm tch h tng k Krng. T di lngm:

- Cui si ch yu l thch anh, cha ct, ct bt mu nu vng, xm tro, gn kt va ncht, cha nc tt. Cui si mi trn tt, chn lc km, chim >45%; ct >40%, cn li lbt. Dy 2,1m.

- St, st bt xen nhau, cng ln trn cng nhiu st. Trm tch c mu xm tro loang l,mu nu , nu vng, phn lp dy, gn kt cht, khng cha nc. Dy 7,1m.

4. Eluvi-deluvi t khng phn chia (edQ): Din phn b hp, thng a hnh +60 m.Thnh phn gm: cui si laterit, st bt b laterit ho gn kt yu. Dy 0,53,5 m.

5. Trm tch aluvi Holocen (aQ2): Phn b dc cc sng sui, to cc bi bi v thm bc Ihp. Trm tch bi bi, phn di gm ct ln sn si; phn trn l st, st bt, ct bt, muxm, xm nu, gn kt cht n yu. Trm tch lng gm: ch yu l ct v t cui, si. B dy0,51,5m.

1.1.2. M agma xm n hp

Phc h nh Qun (Di-GDi/K1 q): L ch yu vng Sui Linh, c dng gn ngthc khong 40 km2 v ri rc cc khi nh vng Sng M , gm 3 pha vi thnh phnthch hc:

- Pha 1: Dng th st v din l nh ven ra ty pha II hay thnh khi nh c lp tim

nhp trong trm tch h tng M v k Rng, thnh phn gm: diorit sm mu ht nh.- Pha 2 chim phn ln khi Sui Linh vi thnh phn: granodiorit biotit horblend ht

va, monzodiorit thch anh, monzodiorit dng porphyr (i tip xc trong).- Pha mch: l cc mch diorit porphyr v spesartit.

Cc thnh to ny xuyn ct v gy sng ha cc trm tch h tng M v kRng.

Trong bin i c t khong vt qung: ch yu - pyrit, arsenopyrit; rt t - galena,sphalerit, molybdenit. Cc b bin i hu magma kh mnh nhng khng u.

Cc c tnh phn d t gabrodiorit - monzodiorit thch anh n granodiorit, kimtrung bnh (Na>K). Bn cht magma l I-granit thuc t hp granitoid vikim thnh to cung magma ra lc a kiu ng c [6]. Granitoid c tim nng khong ha Cu, Mo, Pb,

Zn, Au, Ag.1.1.3. Cu trc - kin to

Cc trm tch tui Jura ch yu c th nm n nghing, cm kh dc v pha ng(3070

0), c th y l phn cnh pha ng ca mt np li. Cc b nt n vi mc

khc nhau.


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t gyc chia thnh 3 h chnh:- H ty bcng nam (290-3000): khng ch cc trng v khi nng hp cng phng,

hot ng ch yu vo Kainozoi. H thng nyng vai tr phn ct sau to qung.- H ng bcty nam (450): hot ng mnh m vo Mesozoi mun v tip sang

Kainozoi, to nn cc khi nng v st xen k ln nhau. H thng ny ng vai tr thun li,

tp trung qung: dc theo t gy pht trin nhiu mch, h mch thch anh - sulphur - vng.- H kinh tuyn: pht trin kh mnh m. y l h t gy c nht.

2. C IM KHONGHA VNG

2.1. c im phn b v hnh thi cc thn qung

Khong ha vng tp trung ch yu i xc gia khi granitoid phc h nh Qun vi trm tch h tng M v k Rng. Vng tn ti chnh dng vng t sinh hayelectrum, xm tn ch yu trong cc mch thch anh, thch anh sulphur v th yu trong ibin i cnh mch.

2.1.1. Vng Sui Linh

Khong ha vng phn b ch yu trong i ngoi tip xc thuc v pha ty khigranitoid thuc pha 2, to i khong ha di>8 km, rng 2 km (ch yu trong i diorit).Phn pha bc, gm cc khu: Cy G, Tng Kho, Hi Ch, Thc , cc thn qung pht trinch yu phng ng bc-ty nam; phn pha nam, gm cc khu: L Than, Mng B, Dng - pht trin ch yu phng ty bc-ng nam; mt s pht trin theo phng v tuynnh Mng B.

1/ Khu Cy G: C 5 thn qung dng mch, mng mch thch anh - sulphur; mi thnqung dy 0,5 18cm, xuyn ct trong gabrodiorit v monzonit theo phng 1052050, dc614

0, cm v ng nam hoc ty nam; i ch tp trung thnh i rng 50cm (theo Cng ty

Khong sn ng Nai).2/ Khu Tng Kho: i qung l h mch, mng mch thch anhsulphur, pht trin theo

cc h khe nt khc nhau; ch yu th nm 15585 v 32060. Theo khai thc ca dn, thn

qung dng tr vi nhiu mch thch anh t sulphur, cm dc ng vi ng knh rng2040m xuyn ct trong gabrodiorit, monzodiorit b bin i. Qung vng c khai thcn su 30m.

3/ Khu Hi Ch.Thn qung l cc mch, h mch thch anh c t sulphur dy t 12 n1015cm xuyn ct trong gabrodiorit, diorit v monzodiorit b bin i. Xcnh 2 thn qungchnh: S6 v S7. S6 (pha ty) c t nht 3 mch vi th nm 30-4010-25 v 34025, mimch di 100200m; S7 (pha ng), gm t nht 2 mch, di 450m theo th nm 2655075,c ni dy 0,6m.

4/ Khu L Than: Thn qung S4[7] l di >430m theo th nm 22050-53, dy trung bnh0,65m (c ni 0,9m); gm nhiu mch thch anhsulphurvng, mi mch rng t 0,1 n0,2m v i bin i c nt rng 1030 cm. Thn qung nm trong i dp v - c nt

ca i ni tip xc gia khi gabrodiorit, monzodiorit vi trm tch h tng M . Dnkhai thc khng lin tc su n 2050m. Pha bc khong 1km, c thn qung S5, pht trintheo th nm 22060.

5/Khu Mng B Dng: Thn qung chnh l i cha h mch thch anhsulphurvng, xuyn ct theo phng ty ty bcng ng nam (pha ty) n v tuyn (pha ng)trong i xc ca khi xm nhp v trm tch. Chng b phn ct v dch chuyn thnh 3on - 3 thn qung: S1, S2v S3[7]. Trong , S1 pha ty, th nm 22660, xuyn ct chnh


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hp vi trm tch sng ha; b dch chuyn bi t gy phng ty bc ng nam; S2v S3ni tip v dch chuyn v pha ng bc, th nm 1902004560, phn b trong gabrodiorit,monzodiorit b bin i. Thn qung di ~1,5km, gm 1 mch chnh dy trung bnh 1m hocnhiu mch nh song song; mi mch dy t vi cm n 30cm; c ly gia cc mch t vi dmn 1418m ( su 2055m) S2(di 400m, dy 0,6 1,2m) v S3 ; ch cn 12 mch S1(di 500 m ,dy 0,4-0,7m).

2.1.2. Vng Sng M

Khong ha vng pht trin trong i ngoi tip xc pha ty khi nh diorit, l lngsng M . vy quanh ch yu l bt kt, st kt, st bt kt h tng k Krng.

i khong ha gm trm tch b bin i c cc mch thch anh-sulphurvng, phttrin theo phng ng bcty nam khang 500m. i b bin i nhit dch dy0,30,5m. i khong ha b t gy phng ty bc - ng nam phn ct v dch chuynthnh 2 khu:

1/ Khu IIIA(ng bc): H mch thch anhsulphur-vng l di 250m, to i rng 35mtheo th nm 1201308085; gm 1 mch dy 1,01,4m v 3 mch nh, mi mch dy0,10,5m.

2/ Khu IIIB (ty nam): H mch thch anh-sulphurvng l di 200m; to i rng 2,5mtheo th nm 1201308085; gm: 1 mch dy 0,81,4m v 1 mch dy 0,10,4m. Ngoira, cn quan st c h mch phng ty bcng nam, th nm 50804570, l h mch thyu pht trin phn nhnh t h mch chnh; gm 2 mch dy 0,30,5m. T l sulphur thp(13%).

2.2. Cc bin i vy quanh

Cc vy quanh b bin i mnh bi cc qu trnh bin i ch yu: sericit ha, cloritha, epidot ha, thch anh ha, carbonat ha nhng mc thay i ty tng ni; bin imnh sericit ha, thch anh ha, carbonat ha nh khu Tng Kho, Sui Mng B hay sericitha, clorit ha, epidot ha, thch anh ha, carbonat nhkhu L Than.

2.3. Thnh phn v c im khong vt qung

2.3.1. T hnh phn khong vt qung

- Vng Sui Linh: Khong vt qung chim 520%; thnh phn (%) ch yu: pyrit 310,arsenopyrit 210, vng t sinh; th yu: galena ~3, sphalerit ~1, chalcopyrit ~1 v electrum.Ngoi ra, cn c t bornit, chalcozin, covenlin. Trong mu gi i cn c t magnetit, rt tilmenit.

-Vng Sng M : Khong vt qung chim 512%; thnh phn (%) ch yu: pyrit 34,arsenopyrit 67. Trong bin i, ngoi cc khong vt trn vi t l thp hn rt nhiu.Trong mu gi i gp: vng t sinh 4 ht/10kg, magnetit 1,06g/T; rt t: galena,sphalerit,chalcopyrit, ilmenit.

2.3.2. Cu to vkin trc qung

-Cu to qung: ch yu dng v xm tn (cc sulphur v vng t sinh, electrum) khngu n rt khng u trong mch thch anh; th yu dng mch (cc sulphur).

- Kin trc qung: t hnh, na t hnh (pyrit, arsenopyrit, galena) n tha hnh(chalcopyrit, sphalerit), nh tng (chalcopyrit trong sphalerit), khm (pyrit, arsenopyrit), tnd, khung xng (magnetit, arsenopyrit, pyrit I).


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2.3.3. c im khong vt qung

-Pyrit: ph bin nht trong mch thch anh v t hn trong i bin i cnh mch. Pyritc 2 th h. Pyrit 1: xm tn hoc tp trung thnh , phn b khng u; kch thc t0,20,5mmn 1,52mm; thng b nt n v xuyn ct bi chalcopyrit, galena,...; i khi, bc nt mnh m cng arsenppyrit. Pyrit II: ht nh dng na t hnh, t hnh vi kch thc

0,2-1mm. - Arsenopyrit: dng ht tha hnh, na t hnh; kch th

c 0,024mm, ch yu0,82,2mm; thng i cng pyrit, xm tn khng u trong thch anh; c ni tp trung thnh c st 23cm3; c 2 th h. Arsenopyrit I: ht t hnh, kch thc ln (ch yu 0,82,2mm).Arsenopyrit II: ht tha hnh, kch thc nh (0,050,5mm), t ph bin hn. Trong arsenopyritI, c vng t sinh, chalcopyrit kch thc nh chen trong khe nt hoc l bao th trongarsenopyrit II. -Vng t sinh: dng ht, vy, cnh cy, li lim, kch thc t 0,10,5mm n0,51,5mm; xm tn khng u hoc to thnh nh c lp hay i cng tp hp sulphurtrong thch anh. i ni, vng dng vi ht ko di xen trong sphalerit. Mt s ht dng bao thng sinh trong pyrit I. - Electrum: t gp di knh, ht nh, tha hnh; thng i cngsphalerit, chalcopyrit. - Galena: dng ht tng i ng thc, kch thc t


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Tng hp 315 363 215 255 125 267

1 M01 IIIB 332 359 169 256

2 M03 IIIA 335 365 172 254

Tng hp

M

332 365 169 256

* Mu 67: tham kho t [7]

T kt qu ny, c th chia 3 khong nhit (0

C) gim dn: 315365, 169267, 125165.Nh vy, cc khong nhit ny ng vi cc giai on to khong vi cc th h thch anhkhc nhau.

- Cc khong vt th yu khc. Calcit: gp ri rc, lp y trong khe nt ca thch anhhoc pyrit; cng sinh cng epidot trong cc mch thch anh nh khng c sulphur. Epidot: khph bin, nht l nhng ni bin i v thng i cng calcit; dng ht tha hnh mo m.Trong cc mch thch anh, ch c rt t. Sericit: vy nh ri rc hoc tp trung thnh m, hay tia mch, lp y khe nt. Chng pht trin trn vy quanh nhng mt khng u,ch yu trn plagioclas b sericit ha. Clorit: t ph bin, ch pht trin trong vy quanh biqu trnh clorit ha trn biotit.

2..5. Hm lng cc nguyn t qung trong cc thn qung

- Vng Sui LinhCc nguyn t Au, Ag v cc nguyn t qung i km: Cu, Pb, Zn, As,... bin i khcnhau trong tng thn qung cng nh gia vy quanh v mch thnh anh sulphur mangqung.

Kt qu tm kim v khai thc c tng hp trn Bng 2 [7].

Bng 2.Tng hp hm lng Au v Ag trong cc thn qung vng Sui Linh

Hm lng (g/T)S

TT Khu

Thn

qung Au Ag

cha qungGhi ch

1 Tng Kho S8 3,5 75 (TB 7) Q-Py-As-Au [7]

7 200 Q-Py-As-Au Cty KSN khai thc (1986)

2 Hi Ch S7 0,3 30,6 Q-Py-As-Au

3 .Hi Ch S6 10117h/40dm3

bin i[7]

4 L Than S4 155 (TB 16) 1030 (TB 20) Q-Py-As-Au

5 S1, S2 1 55 (TB 16)


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Bng4.Hm lng cc nguyn t qung trong mch qung vng Sui Linh

Cc nguyn t qung (Au, Ag g/T; cn li %)TT SH mu V tr Au Ag Cu Pb Zn As Mo Bi

1 KT 4134 Hi Ch 2,16 0,6 91 36 27 122 8


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Au (g/T) Ag Cu (g/T) Pb (g/T) Zn (g/T) As (g/T)

1 H.8/1-Py 19,79 277,0 5.530 4.200 1.390 109.461

2 H10/1-As 14,93 63,8 2.080 2.210 160 111.600

iu ny th hin Vng t sinh Pyrit Arsenopyrit lin quan rt cht ch. Ngoi ra, cngthhin cc nguyn t Ag, Cu, Pb, Zn cng c mi lin quan cht ch vi Au.

Bng7.Hm lng cc nguyn t trong vng t sinh vng Sui Linh

STT S hiu ht Au Ag Cu Hg Tng cng Au/Au+Ag Ghi ch1 1 86,915 12,919 0 0 99,834 0,87 Vng t sinh2 2 86,852 13,027 0,054 0 99,933 0,87 (Au th h I)3 3 90,348 9,968 0,023 0 100,339 0,90

4 4 89,262 10,053 0,007 0 98,322 0,90

Tr ung bnh 88,34425 11,49175 0,021 0 99,607 0,885 5 78,398 20,545 0,035 0 98,978 0,79 Electrum

6 6 76,793 23,312 0 0 100,105 0,77 (Au th h II)Tr ung bnh 77,5955 21,9285 0,0175 0 99,5415 0,78

* Cc ht vng trong mu KT4139/1, c gi bi: Nguyn Kim Hong (Lin on Bn CMN), Trn Trng Ha,Ng Th Phng (Vin a cht, Vin Khoa hc v Cng ngh Vit Nam)

* Phn tch ti Vin a cht v Khong vt hc, Phn vin Siberi - Vin Hn lm Khoa hc Nga, 2005

Theo bng 7, t l Au/Au+Ag, tc l tui vng, phn nh cc ht vng c 2 th h: tui0,88 tng ng th h I vng t sinh; tui 0,78 tng ng th h II - electrum.

3. TRIN VNG KHONGHA VNG

3.1.Kiu m khong

Trong ni dung bi bo ny, dng thut ng kiu m khong (cn gi tt l kiu m -deposit type):Kiu m khong l tp hp t nhin cc m khong v cc biu hin khong snging nhau v thnh phn khong vt, hon cnh a cht thnh to v nhng nhn t ctrng nh: hnh thi thn qung, bin i nhit dch, v quan h ngun gc v khng gian vi

cc thnh to a cht nht nh. Cn kiu khong l kiu m c cng t hp cng sinhkhong vt [5]. y, khang ha l cc mch, h mch thch anh sulphur c cc t hpcng sinh khong vt qung: pyrit I arsenopyrit I vng t sinh, pyrit II, arsenopyrit II galena sphalerit chalcopyrit electrum; i cng, c thch anh th h tng ng. Nhvy,khong ha vng c ngun gc nhit dch, lin quan vi hat ng magma pha 2, phc hnh Qun c th xp vo kiu m: vng thch anh sulphur dng mch, vi 2 kiu khong:vng-thch anh pyrit - arsenopyrit v vng thch anh sulphura kim.

3.2. iu kin hnh thnh v mi lin quan vi hot ng magma

So snh theo phn loi thnh h qung vng theo su ca N. Petrovxkaia, Yu. Xafonov,X. Ser (1976), khong ha thuc loi sulphur va vi kiu a ha: AuFe (pyrit)-As(arsenopyrit) v Aua kim (Pb-Zn-Cu) thnh to gia i su va (1,52,5km cch mt

t) v i su (>3km).3.2.1. Cc gi ai an to khong

Tin trnh to khang vng nhit dch c th phn chia thnh 3 giai an nhsau (Bng 4):-Thch anh(3153650C): Pht trin kh mnh, to cc mch thch anh khng qung theo

cc khe nt, t gy ch yu phng ng bc-ty nam v kinh tuyn, cc b c v tuyn.


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- Thch anh-pyrit-arsenopyrit-vng(1692670C): Pht trin mnh, tip tc c tnh mchng trn cc mch thchanh giai on trc. y l giai an to sn phm chnh.

-Thch anh-pyrit-galena-sphalerit-electrum(1251650C): Cc khe nt tch c tip tcm ra trn cc thn qung hnh thnh nu trn, cc b c phng Ty Bc-ng Nam. ycng l giaian to sn phm chnh nhng hin nay ch thy pht trin trn vng Sui Linh.

- Giai an thch anh-(carbonat)(


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- a ha: Vng Sui Linh, cc vnh phn tn a ha th sinh [7] c lc tng quan theochiu gim dn cc nguyn t ch th bin i: L Than Ag-Pb-As-Zn-Cu; Mng B Ag-As-Cu-Zn-Pb; Dng Cu-Zn-Pb v i 73 As-Cu. Cc nguyn t nguyn sinh trong cc mchqung: Au-Ag tuy c mi tng quan nghch khng cht ch, nhng Au-As v Pb-Zn c mitng quan cht ch (Bng 4, 6). Vng Sng M , cc nguyn t Au, As, Ag, Cu, Pb, Znnguyn sinh c bin i to nn mi tng quan kh cht ch v s bin i gia cc nguynt trong mch qung v bin i cnh mch th hin Au lin quan mt thit vi cc nguynt: Ag, As, Cu, Pb, Zn (Bng 5) - l nguyn t ch th cho khong ha [7]. Theo S. V.Grigorian (1975), dy phn i ng ca vnh phn tn nguyn sinh trong cc m vng nhitdch nhit trung bnh t di ln: (Co, W, Be)-Bi-(Sn, Mo)-Cu-Au- Zn-Pb- (Ag, As, Sb), thp Au-Ag-Cu-Pb-Zn-As-Sb biu hin cho s bc mn phn trn (i trn) cn c vo stng cao hm lng ca t hp cc nguyn t trn nht l As v Sb. Do , c th d onhm lng vng theo chiu su s tng. iu nyc chng minh: hm lng Au trong mchthch anh su 50m trong cc l khoan LK1 v LK9 [7] t 27 g/T.

- a vt l: Vng Sng M , ngoi cc thn qung l ra c pht hin bng cc cngtrnh khai o, ti liu a vt l cng th hin cc d thng m rng v ko di hn.

- Kiu khong ha: Khong ha vng thuc kiu m vngthch anh-sulphur dng mch,

c ngun gc nhit dch nhit trung bnhthp (1252670C). y l kiu m khong ctrin vng min Nam Vit Nam ni chung vi Lt ni ring quy m nh n va.

C th nhn thy, khong ha vng thuc kiu m khong c trin vng; vi mc bcmn a cht v a ha hin nay, mc bc mn qung t trn n gia thn qung. VngSui Linh, c hot ng khong ha vng thch anh sulphur nhit dch mnh hn, phn brng ri hn vng Sng M ; ngc li, mc bc mn qung vng Sui Linh c thsu hn. Nhvy, c th nh gi sb, khong ha vng cn trin vng vi quy m nh.

GOLD MINERALIZATOIN FEATURES OF SUOILINH SONGMADA(LINH SPRING MADA RIVER) AREA AND ITS PROSPECTS

Nguyen Kim HoangUniversity of Science, VNU-HCM

ABSTRACT: SuoilinhSongmada area is situated in Vinhan ore region, in the SW of Dalat zone. Gold mineralization in this region occurred mainly in granitoid of Dinhquancomplex, some of them are found in terrigenous-carbonate sedimentary rocks of formations:

Dakrong and Mada. The host rocks were strongly altered mainly by sericitization,quartization, chloritization, and epidotization. The ores deposits were formed in veins, zonesof veins that their direction is different: mainly in NE-SW, and NW-SE; secondary in sub-

longitude and sub-latitude. They are related to main fault in NW-SE direction. The mineralassociations are mainly presented by pyrite, arsenopyrite, galena, sphalerite, chalcopyrite,native gold, and electrum, occupying 10-20%. The gold mineralization genesis is low-mediumtemperature hydrothermal, (125267

0C) related to calc-alkaline granitoid which was formed

in magmatic arc of active continental margin of ancient East Asia type, developed in Late

Mesozoic. The ore deposit type is vein-shaped gold-quartz-sulfide; mineral types are: gold-quart-pyrite-arsenopyrite and gold-quartz-polymetallic sulfide. With the above-mentioned


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features of spatial distribution and mineralization, gold mineralization of the SuoilinhSongmada area has high potential which should be studied more.

Key words: Suoilinh, gold mineralization, ore deposit type, mineral type, vein-shapedgold-quartz-sulfide, gold-quart-pyrite-arsenopyrite, gold-quartz-polymetallic sulfide

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H mch Q-S-Au xuyn ct qua st bt kt, bt kt htng k Rngim l M3

Mch Q-S-Au c chiu dy n nh xuyn ct dioritb phong ha, v vn c dn khai thc bng gingtheo mch L Than.im l KT4125

Vng t sinh dng c gng , xm tn cng pyrit trongmch Q S Au vng Sng M .Mu gi i. M03

Vng t sinh (Auts) tp hp dng xm tn khngu trong mch Q S Au vng Sui Linh.Mu cc. SL.04

Vng t sinh (Auts) dng ht di trong chalcopyrit

nhtng cng sphalerit (sph) vi tn dPyrit I.Mu khong tng MB3

Pyrit I b chen ln bi chalcopyrit (cha) v electrum

(ele) xuyn ct qua chalcopyrit.Mu khong tng HC1

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As Icha

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