Crystal-chemical and carbon-isotopic characteristics of karpatite (C24H12) from the Picacho Peak Area, San Benito County, California:: Evidences for the hydrothermal formation

被引:35
作者
Echigo, Takuya [1 ]
Kimara, Mitsuyoshi [1 ]
Maruoka, Teruyuki [1 ]
机构
[1] Univ Tsukuba, Tsukuba, Ibaraki 3058572, Japan
关键词
crystal structure; karpatite; stable isotopes; coronene; IR spectroscopy; Raman spectroscopy; DTA; polycyclic aromatic hydrocarbons;
D O I
10.2138/am.2007.2509
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Karpatite from the Picacho Peak Area, San Benito County, California, has been characterized as an exceptionally pure crystal of coronene (C24H12) by infrared absorption analysis, Raman scattering analysis, and differential thermal analysis. Furthermore, the crystal structure of karpatite was determined using a single-crystal X-ray diffraction method for the first time. The mineral crystallizes in the monoclinic system, space group P2(1)/a, with unit-cell dimensions of a = 16.094(9), b = 4.690(3), c = 10.049(8) angstrom, beta = 110.79(2)degrees, V = 709.9(8) angstrom(3), and Z = 2. The structure was solved and finally refined to R-1 = 3.44% and wR(2) = 2.65%, respectively. The coronene molecules in the crystal structure of karpatite are all isolated and the intermolecular distances correspond to van der Waals interactions. The coronene molecules have the high degree of aromaticity and no overcrowded hydrogen atoms, both of which avoid a mixing of other polycyclic aromatic hydrocarbons (PAHs) in karpatite. The corrugated arrangement of coronene molecules constituting karpatite prevents intercalation reactions, accounting for the exceptional purity of this mineral. The isotopic composition of carbon was measured, using an elemental analyzer-isotopic ratio mass spectrometer (EA/IRMS). The present karpatite yielded a delta C-13 value of -22.39 +/- 0.18%(o) (vs. VPDB), which is similar to carbon isotopic compositions of sedimentary organic matter in the far-reaching tectonic regions. This organic matter might be converted to coronene molecules by hydrothermal fluids leading to formation of karpatite. Textural relationships indicate that after the strong concentration of coronene molecules in hydrothermal fluids, karpatite growth postdates both hydrothermal quartz precipitation, and subsequent cinnabar formation.
引用
收藏
页码:1262 / 1269
页数:8
相关论文
共 59 条
[21]  
HAYES JM, 1983, ORIGIN EVOLUTION EAR, P93
[22]  
HIGASHI T, 1995, ABSCOR EMPIRICAL ABS
[23]   Infrared spectroscopy of matrix isolated polycyclic aromatic hydrocarbons. 2. PAHs containing five or more rings [J].
Hudgins, DM ;
Sandford, SA .
JOURNAL OF PHYSICAL CHEMISTRY A, 1998, 102 (02) :344-352
[24]   Raman spectroscopic study of the complex aromatic mineral idrialite [J].
Jehlicka, J. ;
Edwards, H. G. M. ;
Jorge Villar, S. E. ;
Frank, O. .
JOURNAL OF RAMAN SPECTROSCOPY, 2006, 37 (07) :771-776
[25]  
KRUSZEWSKI J, 1972, TETRAHEDRON LETT, P3839
[26]   Structural aspects of aromaticity [J].
Krygowski, TM ;
Cyranski, MK .
CHEMICAL REVIEWS, 2001, 101 (05) :1385-1419
[27]   CRYSTALLOGRAPHIC STUDIES OF INTERMOLECULAR AND INTRAMOLECULAR INTERACTIONS REFLECTED IN AROMATIC CHARACTER OF PI-ELECTRON SYSTEMS [J].
KRYGOWSKI, TM .
JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES, 1993, 33 (01) :70-78
[28]   Separation of the energetic and geometric contributions to aromaticity .2. Analysis of the aromatic character of benzene rings in their various topological environments in the benzenoid hydrocarbons. Crystal and molecular structure of coronene [J].
Krygowski, TM ;
Cyranski, M ;
Ciesielski, A ;
Swirska, B ;
Leszczynski, P .
JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES, 1996, 36 (06) :1135-1141
[29]   Unusually short (C-H•••π) hydrogen bonds for effective supramolecular (aromatic/aromatic) organization in edge-to-face motifs [J].
Lindeman, SV ;
Kosynkin, D ;
Kochi, JK .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1998, 120 (50) :13268-13269
[30]  
LINN RK, 1968, ORE DEPOSITS US, P1624