Sưu tập mẫu khoáng tướng và atlat khoáng vật quặng trong các mỏ nội sinh Việt Nam

Muc tieu va noi dung nghien cihi: - Suu tap mau khoang tudng va cac loai hinh quang noi sinh khac nhau d Vi Nam, xac djnh thanh phan khoang vat va cac dang kien true, cau tao quang - Th

DAI HOC QUOC GIA HA NOI

TRUdNG DAI HOC KHOA HOC TUNHIEN

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TEN DE TAI SUtJ TAP MAU KHOANG TlTdNG VA ATLAT KHOANG VAT ilUANG TRONG CAC MO NOI SINH VIET NAM

Ma so: QT-05-32

Chii tri detai: PdS TSKH Nguyen Van Nhan

OAI HOC QUOC GIA HA NOI RUNG TAM THONG Tl^^ "HL' VIEN

Di/sea

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BAO CAO TOM TAX

a Ten de tai: Suu tap mau khoang tuong va Atlat khoang vat quang trong cac mo n sinh Viet Nam

b Chu tri de tai: PGS TSKH Nguyin Van Nhan

c Cac can bo tham gia:

d Muc tieu va noi dung nghien cihi:

- Suu tap mau khoang tudng va cac loai hinh quang noi sinh khac nhau d Vi Nam, xac djnh thanh phan khoang vat va cac dang kien true, cau tao quang

- Thanh lap Atlat ve khoang vat quang trong cac loai hinh mo noi sinh d Viet Nan

e Cac ket qua dat ducrc:

- Da suu tap duoc 80 mau khoang tudng bao gom cac loai hinh Ichoang san khac nhai

- Da thanh lap mot Atlat ve khoang vat quang thuoc cac kieu quang khac nhau: C

Fe, Ti, Sn-W, Mo Cu, Pb-Zn, Au, Sb-Hg

f Tinh hinh kinh phi cua de tai:

0 13.000.000d

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0 13.000.000d

Tu ngan sach Nha nudc

Kinh phi Dai hpc Quoc gia

Vay tin dung

Von tu cd

Thu hoi

Tong kinh phi thuc chi

icA l^a^ flVv'

PGS TSKH Nguyen Van Nhan XAC NHAN CUA TRUCiNG

1 - J U NHIEN >

SUMMARY

a Title of the project: Collecting mineralography samples and founding Atlas

metallic minerals in intrusive deposits in Vietnam

b Head of the project: Assoc Prof DSc Nguyen Van Nhan

c Participants:

d Objectives and contents of the project:

- Collecting mineralography samples of different types of intrusive ores Vietnam, determining mineral composition, structure and texture of ores

- Founding Atlas of metallic minerals in intrusive deposits in Vietnam

THANH PHAN K H O A N G VAT VA CAC DANG KI^N TRUC CAU

• •

TAO QUANG TRONG CAC M6 NOI SINH VIET NAM

Cac md khoang va cac diem quang kim loai noi sinh phan bo rong rai khap la: tho Viet Nam, nghien cuu chi tiet cd the phan chia ra cac kieu quang vdi nhirng dac die dac trung ve thanh phan khoang vat, kien tnic va cau tao quang sau day:

I, Nhom cac nguyen to Siderophil: Cr, Ti, Fe

•r

LL Kieu quang Cromit

O Viet Nam quang Cromit chu yeu duoc khai thac tir cac md Cd Dinh gan kli xam nhap niii Nua, khoi xam nhap nay chu yeu la peridotit bi secpentin hoa chua Crom

it hon cd dunit, apoharbugit, pyroxenit Cac bieu hien quang Cromit goc dupe biet d noi: Niii Nua va Lang Mun, gan bo khong gian vdi cac khoi xam nhap sieu mafic phan ' dpc theo dut gay Sdng Ma Quang thupc hai kieu nguon gdc: magma sdm va magr

mupn Thdnh phdn chinh cua quang la crompicotit, cromit Quang co cau tao xam t£ dai, thau kinh, 6 vdi kien trttc dac trung hat tu hinh, nua tu hinh kich thudc hat tuong d

deu Quang Cromit Lang Mun co mat trong cac thau kinh hat Idn thupc kieu ngudn g magma mupn (Anh 1)

L2, Kieu quang ilmenit-titanomagnetit

Cac mo va bieu hien quang nguyen sinh thupc kieu nay duoc biet d cac vung >* Chua (Thai Nguyen), Tam Ky (Quang Nam), Xa Hieu (Kon Tum) Chung cd lien qu vdi cac xam nhap gabroid Cac da xam nhap mafic Trias mupn phd bien rpng rai d V Nam lien quan vdi chiing cd quang hoa titanomagnetit hoac ilmenit

Thi du dien hinh la mo quang ilmenit Cay Cham (Thai Nguyen) gan bo vdi c

xam nhap gabroid cd thanh phan chii yeu la gabro, gabronorit va gabro olivin, tro

gabro pegmatit hat Idn lugng ilmenit kha giau Khoang vat quang chu yeu la ilmer titanomagnetit kem theo co cac khoang vat sulfur (pyrit, pyrotin, chalcopyrit ) Qua

pho bien dang xam tan vdi kien tnic dac trung hat tu hinh tam que kien triic phien m

tach dung djch cung (Anh 2, 3)

Mo ilmenit Niii Chiia thupc kieu magma mupn Ngoai quang Ti Fe co y ngi cong nghiep trong cac thanh tao gabroid con co cac bieu hien khoang Pt, Cu, Ni Co

/ i Kieu quang magnetit trong skarn

Anh 1 Kien true hat cromit Cr Hon Vin DPD 75x Nicon (-)

Anh 2 Hmenit trong tap hpp titanomanhetit Ti Cay Cham DPD 150x Nicon (-)

Anh 3 Kien true dang phen nua - tach dung dich ci'mg Titanmagnetit Ti Tam Thanh - Tam

Ky DPD 150x Nicon (-)

Anh 4 Kiln true hat nua tu hinh manhetit trong granat Fe Na Rua DPD 37x Nicon (-)

Cac md quang sat ngudn goc skarn co y nghTa cong nghiep idn nhat d Viet Nam dupe biet d cac vung Cao Bang, Ha Tinh bao gom quang magnetit trong skarn Ca (Cao Bang), va quang magnetit trong skarn Mg-Ca (Ha TTnh)

Cac md quang sat skam-Ca Cao Bang thudng hinh thanh d ddi tiep xiic ciia cac xam nhap granit - granophyr tuoi Trias vdi cac da carbonat hoac vdi phun trao axit Quang cd dang thau kinh, via phan nhanh hoac dang mach Thanh phan quang chii yeu la magnetit, doi khi co cac khoang vat sulfur

Mo quang sat trong Mg-Ca Thach Khe (Ha TTnh) la ddi tugng cd y nghTa cong nghiep Idn Than quang phan bd d ddi tiep xiic giiia xam nhap granit vdi da voi (C2-P1) hoac tiep xiic giua tram tich carbonat vdi tram tich luc nguyen Devon va da simg (T2.3)-

Than quang cd dang thau kinh va dang phan nhanh phuc tap Thanh phan quang chu yeu

la magnetit, thii yeu cd hematit va cac sulfur (pyrit, pyrotin, chalcopyrit, sphalerit ) Cau tao quang thudng gap trong cac md noi tren thudng la cau tao khdi dac sit vdi kien true

hat tuong doi deu (Anh 4, 5)

L4 Kieu quang magnetit - hematit

Cac md va bieu hien quang nay gap d nhieu noi Dua vao thanh phan khoang vat

CO the chia ra 2 kieu khoang: magnetit hematit kieu Trai Cau, thach anh hematit magnetit kieu Lang Khuan.Kieu khoang dau cd lien quan vdi cac da magma mafic (phun trao va a phun trao) cd nguon goc nhiet dich trao doi, kieu khoang sau thudng gap trong cac ddi diit gay ca nat

-Thanh phan khoang vat chu yeu la magnetit, hematit, thii yeu co pyrit, pyrotin,

chancopyrit, sphalerit, galenit Khoang vat mach bao gom thach anh, canxit, epidot, clorit,

baryt Quang thudng cd cdu tao khoi, vi cau tao mach vdi kien triic hat nua tu hinh va

tha hinh (Anh 6)

II Nhom nguyen to chalcophil (Cu, Pb-Zn, Au, Sb-Hg, Mo)

2.L Kieu quang chalcopyrit - magnetit - orthit (trong dd bien chat trao doi)

Hien da biet cac md va diem quang vung Sinh Quyen Cac than quang thudng tao thanh ddi keo dai theo phuong Ddng Bac - Tay Nam cd dang thau kinh hoac mach keo dai Quang tap trung trong da bien chat trao doi sam mau (hastingsit biotit) it hon trong

da gneis biotit magmatit hoa va amphibolit

Anh 5 Kien true hat nua tu hinh manhetit dan xen vdi granat Fe Thach Khe DPD 75x Nicon (-)

Anh 6 Vi cau tao dai manhetit - hematit Fe Trai Cau DPD 37x Nicon (-)

•

Thanh phan khoang vat quang rSt phuc tap, chii yeu la pyrotin, chalcopyrit, magnetit,

pyrit, menhicovit, orthit, thii y6u cd sphalerit, tetraedrit, marcasit, cubannit, arsenopyrit,

hiem gap cd cobantin, lolingit, molybdenit, vang tu sinh, calaverit, crenerit Quang co

cau tao khdi, dai, mach vdi kien true hat tu hinh, tam thanh, ca nat, gam mon thay the

(Anh 7, 8, 9, 10)

2.2 Kieu quang pyrotin - pentlandit - chalcopyrit (quang sulfur Cu - Ni trong

dd sieu mafic - mafic)

Cac md va bieu hien quang fulfur Cu - Ni dugc biet d nhieu noi: Son La, Tra Lim, Dac Sa Mo Cu - Ni Ban Xang (Son La) la md co gia tri cdng nghiep dang ke lien quan vdi khoi dunit ciing ten Khoi xam nhap co dang long chao khdng chan xuyen qua cac thanh tao da sung xen da phien mica, quarzit va da hoa Devon Md gdm 3 kieu quang khac nhau: dang mach (tiem nhap), dang di ly khong deu (dung ly) va kieu quang phong hoa Than quang dang mach la loai quang dac sit hinh thanh theo kieu lap day khe niit doc diing nam ngoai khoi xam nhap sieu mafic Than quang dang xam tan phan bo d day

nham the xam nhap tira dang long chao To hap khoang vat cong sinh dac trung la: pyrotin, pentlandit, chalcopyrit, magnetit Dac biet trong thanh phan quang con co nhieu

khoang vat ciia Co, Ni, telurua Ag, Au, Bi, Au tu sinh, Pt tu sinh va nhdm Pt, Se nhu Nikelin, rammensbergit, violarit, maucherit, cobantin, glaucodot, skuterudit, Au tu sinh, electrum (Au, Ag), calaverit, krenerit, tellurobismuthit, sperylit, Pt tu sinh, michenerit

Quang cd cdu tao khdi, xam tan, mach vdi cac kien true hat tu hin , tha hinh, ca

nat, gam mon thay the, dang ngpn lua - tach dung dich ciing (pyrotin - pentlandit) (Anh

11, 12, 13, 14)

2.3 Kieu quang Cu thach anh - chalcopyrit

Cac md va bieu hien quang kieu nay gap d Van Sai, Quy Hudng, Luong Son, Sudi Tiat lien quan vdi hoat dpng phun trao mafic Than quang thudng cd dang mach, lap

d^y khe niit hoac be mat phan Idp giua cac da phun trao bi ep phien hoa Khoang vat chii

yeu la chalcopyrit, khoang vat mach la thach anh Doi khi trong td hgp khoang vat quang

cdn gap pyrotin, menhicovit, sphalerit, galenit, bismut tu sinh, foseit (telurua Bi), Au tu

sinh, bornit, chancozin, pyrit Quang co cdu tao mach xam tan vdi kien tnic thudng gap

hat tha hinh, tach dung dich cirng (Anh 15)

Anh 7 Chalcopyrit - cubanit - clorit (dang la ma) xen giu'a tap hpp hat manhetit tir hinh Cu

Sinh Quy^n DPD 150x Nicon (-)

Anh 8 Kien true dang phen - tach dung dich cung Cubanit - chalcopyrit Cu Sinh Quyen,

DPD i50x Nicon (-)

Anh 9 Vang dang hat tu hinh trong chalcopyrit Cu Sinh Quyen DPD 150x Nicon (-)

Anh 10 Chalcopyrit, pyrotin, clorit xen lap giiia tap hpp hat manhetit Cu Sinh Quyen DPD

150x Nicon (-)

Anh 11 Chalcopyrit xen lap giiia tap hop khoang vat tao da Cu-Ni Ban Xang DPD 150x Nicon (-)

Anh 12 Pentlandit cung pyrotin xen lap giiia khoang vat tao da Cu - N i Ban Xang DPD

150x Nicon (-)

Anh 13 Pyrotin, chalcopyrit xen lap vao giua khoang vat tao da Cu-Ni Ban Xang DPD 150x Nicon (-)

Anh 14 Manhetit hat nho tu hinh ciing chalcopyrit xen lap giua khoang vat tao da Cu-Ni

Ban Xang DPD 150x Nicon (-)

Anh 15 Chalcopyrit ven ria bj bien doi mpt phan thanh chalcozin xen giua thach anh Cu Van

Sai DPD 75x Nicon (-)

Anh 16 Dong tir sinh trong da bazan Ban Mua DPD 150x Nicon (-)

2.4 Kieu quang Cu tu sinh

Cac bieu hien quang ddng tu sinh pho bien rpng rai d ddi Sdng Da nhu Ban Mua, Hudi Long, Nam Mudi, Chieng Ddng (Son La) Dong tu sinh phan tan trong da phun trao mafic dang hat nhd Khoang vat mach la thach anh, clorit, zeolit (Anh 16)

2.5 Kieu quang chalcozin - bornit (Cu trong cdt kit)

Cac md va bieu hien quang gap d vung Mau Son, Bac Giang va nhieu noi khac Quang hoa phat trien trong cat ket, da phien set vdi mau do, cd khi phan bo giiia cac da phun trao mafic va axit Than quang dang thau kinh det, mach, hoac xam tan trong cat ket

hat thd Thdnh phdn khoang vat chu yeu la chalcozin, bornit, chalcopyrit, tetraedrit, thu

yeu CO sphalerit, galurit, burnonit, arsenopyrit, pyrit, cinabar Khoang vat mach: thach

anh, nhdm carbonat, baryt Cdu tao quang thudng pho bien dang xam tan, mach vdi cac

dang kien true hat tu hinh, tha hinh dang riem, tach dung djch cung (Anh 17, 18)

2.6 Kieu quang sphalerit - galenit - casiterit gidu Ag

Kieu quang nay bao gdm cac mo va bieu hien quang d Ngan Son, Tong Tinh, Thugng Am, Ban Ngpc dien hinh la md Ngan Son Trong vung phat trien cac thanh tao granit - leucogranit Than quang co dang mach, o lap day cac dudng diit gay hoac phan

bo dpc cac ddi dap vd kien tao, doi noi quang lap vao giua mat phan Idp ciia da voi va da phien vdi Da vay quanh thudng bi bien ddi nhiet djch: thach anh hoa, greisen hoa, clorit

Thdnh phdn quang chd yeu la: sphalerit, galenit, arsenopyrit, pyrit, thu yeu la

chalcopyrit, pyrotin, casiterit, stanin, tetraedrit, hiem gap c6 pyrargirit, prustit, calfindit, stephanit, burnonit va cac khoang vat khac Quang hoa cd tinh phan ddi, tu tiep xiic ciia the xam nhap ra vung da vay quanh cd cac ddi sau:

- Ddi quang sulfur (pyrit, arsenopyrit) chiia casiterit d tiep xuc ngoai xam nhap granit, hoac trong da phien sericit vay quanh

- Ddi quang sphalerit - galenit chiia stanin (casiterit) trong da phien sericit va da vdi

- Ddi quang galenit chii yeu bao gom cac khoang vat sulfo mudi trong da voi

Quang thudng cd cdu tao khoi, mach, xam tan, dai vdi kien triic thudng gap hat tu

hinh, tha hinh, ca nat nhii tucmg tach dung dich ciing (sphalerit chalcopyrit, sphalerit stanin) (Anh 19, 20.21,22.23)

-n^

Anh 17 Chalcopyrit dang riem xung quanh Bocnit Cu Bac Giang DPD 150x Nicon (-)

Anh 18 Vi cdu tao riem chalcopyrit - bocnit xung quanh tap hpp hat nho coveniin Cu Bac

Giang DPD I50x Nicon (-)

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Anh 19 Stanin tach dung djch ciing trong sphalerit bi ca nat dugc canxit xuyen lap gan ket Pb

- Zn Ngan San DPD 75x Nicon (-)

Anh 20 Mach galenit xuyen cat qua pyrit va sphalerit c6 chua chalocpyrit Pb - Zn Ngan San,

DPD 75x Nicon (-)

Anh 21 Arsenopyrit va sphalerit co chua chalcopyrit bj ca nat dugc canxit xuyen idp Pb - Zn

Ngan Son DPD 75x Nicon (-)

Anh 22 Rutil dang hinh kim phan tan trong da Pb - Zn Ngan San DPD 150x Nicon (-)

Quang thudc kieu ngudn goc nhiet dich nhiet dp cao - trung binh

2.7 Kieu quang sphalerit - galenit - pyrit - arsenopyrit

Dien hinh cho kieu quang nay la md da kim Chg Di6n Vung md n t o trong t^ng cau tnic Devon (D| - D2) gom da phien set, da vdi phan Idp cd bitum Than quang dang mach (ddc thoai va ddc diing) l4p day diit gay, dang Idp tiem nhap kieu trao d6i thay th^, dang tru Da vay quanh thudng bi bi6n ddi nhiet dich dolomit hoa, thach anh hoa, clorit

hoa Thdnh phdn khoang vat chd yeu la sphalerit, galenit, pyrit, arsenopyrit, magnetit, tetraedrit, hiem gap pyrargirit, prustit, calfindit, bismut tu sinh, vang tu sinh Cau tao quang thudng gap dang khdi, mach, dai vdi cac kien true hat tu hinh, tha hinh, gam mdn

thay the, ca nat, nhO tuong - tach dung dich cung (sphalerit - chalcopyrit) (Anh 24, 25)

Quang da kim Chg Dien cd nguon goc nhiet djch trao doi nhiet dp trung binh cao

2.8 Kieu quang sphalerit - galenit trong dd carbonat

Kieu quang nay phd bien rdng rai d phan mien Bac nudc ta: Lang Hit, Con Minh, Thanh Mpi, Trang Da, Tan Trao, Quan Son, My Diic Phan Idn quang phat trien trong cac tang da voi da vdi dolomit Than quang cd dang mach, thau kinh doi khi dang Idp

trao doi Thdnh phdn khoang vat rat don gian, chii yeu la sphalerit, galenit, cac khoang

vat khac nhu chalcopyrit, pyrit, quang dong xam, burnonit, pyrotin, arsenopyrit c6 so

lupng khdng dang ke Khoang vat mach c6 thach anh, nhdm carbonat lan baryt Cdu tew quang thudng gap: khdi, xam tan vdi kien triic: hat tha hinh, xen lap (Anh 26)

Quang thudc kieu nguon gdc nhiet dich trung binh thap - thap

2.9 Kieu quang galenit - sphalerit v&i sulfo muoi Pb vd Sb trong da phun trdo kiem,

Dai dien cho ki6u nay la cac mo Tii Le, vung Na Son Viing mo Pb-Zn Tii Le phat trien trong cac tudng orthophyr, thach anh, cac da tram tich phun trao, da phien sericit -

clorit cd tu6i J-K Than quang chu yeu cd dang mach Khoang vat quang chu yeu la

sphalerit, galenit, thu y6u cd pyrit, geocronit, chalcopyrit, arsenop>Tit, tetraedrit, pyrotin,

Au tu sinh, semseit, hematit Khoang vat mach: thach anh, sederit, dolomit, canxit

cdu tao quang dac trung: ddi keo, dai co nhip dam ket khoi mach vdi cac kien true hat tha hinh, xen l^p, ca nat (Anh 27, 28, 29, 30)

Quang CO ngudn goc nhiet dich nhiet dp trung binh - thap

Anh 23 Kien triic hat tha hinh pyracgirit giiia galenit Pb-Zn Ngan Son DPD 150x Nicon (-)

Anh 24 Vi cau tao dai sphalerit - pyrit Pb - Zn Chg Dien

17 0A\ HOC Q u o c G I A HA N Q I

•RUNG TAM ^ H O N G T:!; '-^U VEN

Anh 25 Tap hgp sphalerit bj ca nat dugc canxit gan kgt Pb-Zn Chg Dign DPD 75x Nicon (-)

Anh 26 K^t hgp a chQ- c6 sphalerit va galenit Pb - Zn Lang Hit DPD 75x Nicon (-)

Anh 27 Sphalerit kien triic hat 6hu nhau dugc galenit bao quanh giiia tap hgp thach anh Pb

Zn Tu Le DPD 75x Nicon (-)

Anh 28 Cau tao dai sphalerit - galenit - thach anh Pb - Zn Tu Le DPD 75x Nicon (-)

Anh 29 Galenit xen lap giua tap hgp hat sphalerit Pb - Zn Tu Le DPD 37x Nicon (-)

Anh 30 Mach galenit xuyen lap giua mach thach anh Pb - Zn Tu Le DPD 37x Nicon (-)

2.10 Kieu quang galenit - thach anh

Phan Idn cac md va diem quang Pb-Zn d mi6n nam nudc ta deu thugc ki6u quang nay, dien hinh la cac md Tien Thuan, nam An Khe, Gia Bac Chiing deu n^m trong cac

da granit Quang cd dang mach Thdnh phdn khoang vat chu yiu la galenit, sphalerit, chalcopyrit, pyrit Khoang vat hidm gap la electrum (Au, Ag), telurur Ag Cdu tao quang chii yeu dang mach, khoi vdi cac dang kien true hat tu hinh, ca nat, xen ISp (Anh 31, 32)

Quang CO ngudn goc nhiet djch nhiet do trung binh

2.1 L Kieu quang pyrit - sphalerit - galenit - chalcopyrit (conchedan Cu - da kim)

Dai dien cho ki^u nay cd cac md Diic Bo (Quang Nam) va d ddi Song Da nhu Lang Cu, Minh Quang, Lung Cua, Lang Chanh Mdi trudng chua quang la cac da "phi^n

luc", phun trao mafic Khoang vat quang chu yiu la sphalerit, galenit, pyrit, chalcopyrit, thu yeu arsenopyrit, pyrotin, tetraedrit, burnonit, altait (PbTe) Quang thudng co cdu tao mach, khdi, xam tan vdi cac dang kien true hat tu hinh tha hinh, ca nat, gam mon thay

the Kien triic nhu tuong - tach dung dich cung (Anh 33, 34, 35, 36) Quang co nguon goc nhiet dich - phun trao nhiet do trung binh - thap

2.12 Kieu quang vdng - thach anh - sulfur

Dai dien cho kieu quang nay la cac md vang Pac Lan, Bdng Mieu va nhieu mo, diem quang vang d Quang Nam, mien Trung va Tay Nguyen Than quang la nhij*ng mach thach anh mach nhd, mang mach, dang duoi ngua cat qua da vay quanh thupc cac thanh tao tram tich luc nguyen, phun trao va bien chat co tuoi khac nhau

Thdnh phdn quang chu yeu la pyrit, arsenopyrit, sphalerit, galenit, chalcopyrit,

pyrotin, thu yeu co quang ddng xam, rutin, Au tu sinh, electrum, khoang vat mach chii

yeu la thach anh Quang cd cac dang cdu tao xam tan, khdi, mach vdi cac dang kien true

pho bien: hat tu hinh, tha hinh, ca nat, gam mdn thay the, xen lap, nhu tuong - tach dung dich cung (Anh 27, 38, 39, 40, 41, 42, 43, 44, 45, 46)

2.13 Kieu quang vdng - bismutin - specularit

Thudc kieu quang nay co cac diem quang suoi Tiat (Phu Yen Son La) Hien Song Con, Thang Phudc (Quang Nam) va mot so noi khac Than quang la nhung mach thach anh sulfur lap day khe niit hoac phat trien theo be mat phan phien ciia cac da co

-thanh ph4n thach hpc khac nhau Thdnh phdn khoang vat gom co p>Tit arsenopyrit

Anh 31 Electrum xen giiia galenit trong thach anh Pb-Zn-Au Nam An Khe DPD 150x Nicon (-)

Anh 32 Pyrotin va sphalerit xuyen lap giu'a thach anh Pb-Zn - Au Nam An Khe DPD 75x,

Nicon (-)

Anh 33 Cau tao 6-xam tan pyrit-sphalerit-galenit trong bazan cau tao hanh nhan Pb-Zn Lang Cu

Anh 34 Pyrit bj ca nat dugc sphalerit, thach anh xuyen lap Pb - Zn Lang Cu DPD 75x

Nicon (-)

Anh 35 Kien true a chii co giua sphalerit va galenit Pyrit -Pb-Zn Minh Quang DPD 75x

Nicon (-)

Anh 36 Galenit xuyen lap giiia pyrit va sphalerit chi'ra nhu tuong chalcopyrit pyrit Pb - Zn

Minh Quang DPD I50x Nicon (-)