|
|
本帖最后由 德道 于 2010-10-30 22:21 编辑 / U2 z8 I( ]) Q/ H& k& x4 s
( d' |9 O" ]; JBurmite or Burmese amber has been known since the distance past. This amber is from the Hukawng Valley in Kachin , ~" j: j B: n$ @ j0 \' X* p
State the northenmost state in the union of Myanmar formally known as Burma . According to ancient Chinese sources 0 X' l' z _1 z
amber from the Hukawng Valley was mined as early as the first century AD and shipped to Yannan Province in China .
* h# H( |# n6 f7 @+ ^( Z/ EFrom there, burmite may have found its way along the Silk Road as far west as the Roman Empire , where amber was
; A$ @8 Z6 l9 Y* z! C( x; Hhighly prized. It is said that that a good piece of amber was worth the price of a slave. The oldest written record referring 9 S+ O0 e4 \; V+ m6 l& T
to Burmese amber was in the Annals of the Han Dynasty (205-265 AD). Thus, burmite has been known for about two
/ [" [% V. ]' |8 }, ]thousand years. Much of the exquisitely carved Chinese amber has its origin in the Hukwang Valley . Amber was also 3 e2 Q1 @* m/ N7 h4 O' X
used and is still used in Chinese medicine.
$ R& [5 M8 P# A; t# L# `/ ?, ~% B( x; U# r
The first mention of burmite in the western world by a European was by a Portuguese Jesuit Missionary Father Alvarez 4 r, R2 _& Q: R; M, Q3 R8 z* Z( g
Semedo in 1655. He noted that red amber from Yunnan Province in China . In 1738, there is another brief reference to
6 \+ u' m5 s+ p5 Ured amber from Yunnan Province by Du Halde. ! F* ]3 P, ^/ J, z( B
$ t5 X# v: V6 y& R5 ~' [
In the 19th Century, there were a series of reports about the location and mining of Burmese amber By Brester (1835) * a% ?' ], r& Y+ F/ q
and Pemberton (1837). Captain S. F. Hannan was the first westerner to visit the amber mines in the Hukong (Hukawng) 3 V! C a+ O! O6 `
Valley. He described the primitive mining method utilized by the miners to recover amber consisting of digging shallow ) X' v9 s- o" a& z* x' U9 D3 w5 ]
pits with sharpened bamboo and wooden shovels. Description of the amber mines was given by Griffith in 1848 from the
1 t* K' f9 q" j1 h: D( o! h“Hookhoom” Valley. Some pits, he observed were up to forth feet deep. 6 m3 J4 q2 U4 m. }# o/ f A8 Z: w( F
/ u* N# z3 O3 z( A+ b- d6 [
In 1885, the British invaded and conquered Upper Burma deposing and sent into exile the Burmese Royal Family to
3 X) p; ?9 u- pIndia . Burma became an annex of India . With the arrival of the British the main trading route in amber went south to
" F2 c+ Y3 k5 c8 z7 `3 `Mandalay rather than to China . The Geological Survey of India sent Dr. Fritz Noetling to evaluate the resources of
8 v6 R1 P1 Z2 Fnorthern Burma in 1892. Amber recovered from the Hukwang Valley was examined by Otto Helm who gave the name
; m) t1 T( t( r( f) Hburmite to the amber from that area. Noetling also noted the presence of insects in amber thought to be from the area in 6 n+ g7 q" _, W5 ~, r/ t3 i& w3 o" _
1893. & n4 C5 z- _- _) _: d
, e/ b$ L3 X9 f) nIn the first half of the twentieth century, scientific study and production continues until 1939. With the advent of the - _( `3 P( P6 T
Second World War, both the production and study languished until the 1990’s. This was due not only to the war but also ) u3 `" a) | ]/ }5 J8 l& G
internal turmoil within Burma following its independence from Britain in 1947.
& c E3 L# e2 @( Y8 H* ]# ]5 ~# Q& i6 g" Y6 _4 k
Cockerell (1917) published the first scientific paper on insect inclusions in burmite. He considered burmite to be possibly 7 m: }& Y) a) f: ]' M) h
Upper Cretaceous in age. The Indian Geological Survey published yearly production figures from the Myitkyina District
6 x _$ ~- S7 c8 m( j' i' sfrom 1898 until 1940. During this period a total of approximately 82,656 kilograms of amber were produced from the
8 B, ~' ^; o# p7 z5 s' C5 S; CHukawng Valley . Scientific papers during this period include work by Stuart (1922), Cocherell (1922), Williamson * H( u1 ~, v. @
(1932), and Chibber (1934). These authors concluded that the age of burmite was Eocene or about the same age as " }8 A3 x" b0 H8 C6 s, B* a
Baltic amber. This interpretation was based on a single observation of limestone debris dug from one of the amber pits. - i1 s8 |/ H) H# d5 o$ h) q. J; C
Chibber (1934) contains the most detailed report of the amber mines in the Hukawng Valley during this period. ) r1 G5 ]8 X( M. ^
7 h5 T3 j( e/ {4 I0 K; ?" [4 jDuring the Second World War there was much fighting in the Hukwang Valley between the advancing allies and the ' b3 Y/ y& ~7 l: n! v* E
Japanese Army culminating in the fierce battle for Myitkyina the capital of Kachin State in 1944. The war also saw the
8 f) T D, A F, z' L1 Y9 bconstruction of the Ledo Road through the Hukwang Valley from Ledo in India to Mytiknina to Lashio where it connected # q& I% E2 p. O1 o3 g$ d& M2 \
up with the Burma Road to China . This road provided a back door to supply China with desperately needed war % N' n0 A& J: |; S+ Y8 e
material. / D' ]: Z# z0 m8 R5 W
' P5 `; R/ t0 u' b0 ~/ S& eSince independence, Burma has been racked by internal insurgencies including fighting between the Kachin
- S. i* A( ?& w% E6 q. M y' oIndependence Army (KIA) and the government. It was not until the 1990’s that a peace treaty was signed and limited ; m7 ?0 [7 Q+ J1 }7 F# @- G2 b
access to the amber mine was possible. In 1989, the county was renamed Myanmar , which was the original Burmese ( f1 Q5 D8 A1 v# g1 K9 i9 x
name of the country. / u0 n7 V6 X( t7 ]2 U8 y
' ]5 k8 D7 O' SSince the beginning of the Second World War until recently there was been a sixty year hiatus in production. Dr. David
3 b7 e w5 O0 x. fGrimaldi comments in his book on amber published in 1996, “Today, burmite has almost legendary appeal, in part
: \5 l# `' Y- T) M. H& Cbecause the deposits are no longer mined and the supply is generally not available.” 1 X1 Q7 ^3 \ N
9 Q. }2 p" ?4 ^: N7 e! G% L, ~
Leeward Capital Corp., a Canadian Mining company began exploration in 1996 in northern Kachin State for gold and
0 L) Y2 o6 U: ]* a. B6 N; ^platinum. With the collapse of the junior mining market due to the Bre-X Scandal in Indonesia and the drop in the gold
9 _( G1 T% ?) |1 V2 a4 A) G+ Eprice, this exploration ceased due to the lack of funding. In 1999, Leeward began to evaluate the possibility of reopening
. Q/ W1 W9 t; K# q" T+ h9 @; h% kthe amber mines in the Hukwang Valley . Limited production was achieved in 2000, and is currently about 500 kg per
. Z8 `- b! f- {3 @year. The initial 100 kg gathered in the first two years was sent to Dr. Grimaldi at the American Museum of Natural
1 ]3 x+ }) x3 b: O3 i0 q& o& _; N$ MHistory in New York for scientific study. In 2000, Zherikjin and Ross of the Natural History Museum , London published a 2 ^" G8 P, }& h5 ^% n. q: w. B
scientific paper on burmite in which they determined a Cretaceous age for burmite. Grimaldi et al (2002) published a ) B9 p# K2 E5 `0 @7 s
scientific paper confirming the age of burmite as Cretaceous. Also in 2002, Cruichshank and U Ko Ko published a # `* i" R; w8 I3 e$ ^$ c
description of the amber mines in the Hukwang Valley giving the amber a an Albian or uppermost Lower Cretaceous
( F! ?9 v" i$ Q& p; U& oage. This dates burmite as at between 100,000,000 and 110,000,000 years old. Burmite is thus the oldest locality from
% }% k( {9 E" M$ D2 H+ j, u* lwhich commercial deposits of amber can be mined. Leeward remains the sole exporter of this rare and precious amber.
) W. D) n8 @. c. Y: g, H; r- f8 C* l
Since scientific study of burmite began, there have been numerous scientific papers on the unique biota found in
) I3 n) p4 m8 ^5 F* w% tburmite. This book illustrates the diversity of animal and plant life preserved in this ancient amber.
1 l. |3 o+ J$ g! ]' l0 E |
|