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Amphibole compositions and metamorphic history of the Rand Schist and the greenschist unit of the Catalina Schist, Southern California (1986)

Jacobson, C. E. ; Sorensen, S. S.

Springer

Contributions to mineralogy and petrology 92 (1986), S. 308-315

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract The Catalina Schist and Rand Schist are two high P/T terranes in southern California. The Catalina Schist is correlated with the Franciscan Complex and occurs in the continental borderland. It consists of a blueschist-facies melange tectonically overlain by a “greenschist” unit, which, in turn, is overthrust by an amphibolite unit. The greenschist unit itself is inversely zoned from epidote-amphibolite fades at the top through greenschist facies in the center to transitional blueschist-greenschist facies at the base. The Rand Schist is part of the eugeoclinal Pelona-Orocopia Schist terrane, which lies interior to the present continental margin, structurally beneath Precambrian to Mesozoic sialic basement. The Rand Schist is inversely zoned from epidote-amphibolite facies to transitional blueschist-greenschist facies, similar to the greenschist unit of the Catalina Schist. Two trends in amphibole composition, one from actinolite to hornblende in greenschists and epidote amphibolites (calcic series) and the other from actinolite through winchite to crossite in glaucophanic greenschists (sodic-calcic series), are present in both the Rand Schist and the greenschist unit of the Catalina Schist. The transition from actinolite to hornblende in the calcic series is defined by increases in tschermakite, edenite, and glaucophane substitution. Amphiboles of the sodic-calcic series differ mainly in the degree of glaucophanic substitution. The similarity of amphibole trends in the two terranes indicates that they were metamorphosed at approximately the same pressures and temperatures, and is evidence that the Rand Schist originated in a subduction zone, despite its present intracontinental setting. Most glaucophanic greenschists in the Rand and Catalina Schists contain both a sodic and a calcic member of the sodic-calcic series. Textural relations indicate that calcic members generally developed after the sodic ones. This implies that sodic amphibole formerly may have been present in many of the structurally higher greenschists and epidote amphibolites. Preservation of the inverted zonations, as well as microstructural evidence for the syntectonic development of calcic and sodic-calcic amphiboles, suggest that glaucophanic greenschists, greenschists, and epidote amphibolites all formed during underthrusting (subduction). This contrasts with many orogenic belts, where replacement of blueschists by greenschists to amphibolites is attributed to thermal reequilibration during erosional unroofing.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00572159

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Effect of captopril on renal haemodynamics and the renin-angiotensin-aldosterone and osmoregulatory systems in essential hypertension (1986)

Thomsen, O. Ø. ; Danielsen, H. ; Sørensen, S. S. ; [et al.]

Springer

European journal of clinical pharmacology 30 (1986), S. 1-6

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ISSN: 1432-1041

Keywords: captopril ; essential hypertension ; renal haemodynamics ; renin-angiotensin system ; blood pressure reduction ; vasopressin ; osmoregulation

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Medicine

Notes: Summary The effect of captopril on renal plasma flow (RPF), glomerular filtration rate (GFR), plasma concentrations of renin, angiotensin II (Ang II), aldosterone (Aldo) and arginine vasopressin (AVP), serum osmolality (Sosm), free water clearance $$(CL_{H_2 O} )$$ , fractional urinary excretion of electrolytes and blood pressure (BP), was examined in 10 patients with moderate essential hypertension. Placebo plus furosemide was given for 6 weeks, followed by a 6-week period on captopril and furosemide. The renin-angiotensin-aldosterone system was partly blocked by captopril, resulting in a 18% fall in BP. GFR was reduced by 8% during captopril treatment, whereas RPF remained unchanged. Water loading-induced suppression of Ang II and AVP was inhibited by captopril therapy. Without affecting BP in the placebo period, water loading almost abolished the captopril-induced reduction in BP. It is concluded that non-acute captopril treatment of moderate essential hypertension reduces GFR slightly, possibly by producing dilatation of efferent arterioles. The antipressor effect of captopril is lessened during volume expansion, which may be secondary to reduced activity of the renin-angiotensin-aldosterone and osmoregulatory systems.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00614186

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Primary fluids in low-temperature eclogites: evidence from two subduction complexes (Dominican Republic, and California, USA) (1994)

Giaramita, M. J. ; Sorensen, S. S.

Springer

Contributions to mineralogy and petrology 117 (1994), S. 279-292

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ISSN: 1432-0967

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract Eclogites occur as isolated blocks in melanges of both the Samana Peninsula, Dominican Republic, and the Franciscan Complex, California, USA. In some of these eclogites, fluid inclusions were found in omphacite and sodic-calcic amphibole grains. Textures show that non-planar populations of fluid inclusions formed during growth of clinopyroxene and amphibole. In addition, planar arrays of secondary fluid inclusions are found along healed cracks. Homogenization temperatures to liquid were used to calculate isochores for the fluid inclusions. These data were compared with petrologic geothermobarometry. Temperature conditions of 500–700° C were estimated from garnetclinopyroxene geothermometry. The jadeite contents of omphacite indicate minimum pressures of 8–11 kbar in this temperature range. The P-T estimates agree well with calculated isochores for primary fluid inclusions from the Samana Peninsula, and show some overlap for both primary and secondary fluid inclusions from the Franciscan Complex. Salinities of 1.2–5.3 wt% NaCl equiv. were estimated for both primary and secondary fluid inclusions from Samana and Franciscan eclogites. These data suggest that low-salinity aqueous fluids attended eclogite-facies metamorphism and perhaps retrograde metamorphism in both subduction complexes. The salinities and densities of fluid inclusions in eclogites from the Samana Peninsula and the Franciscan Complex resemble those of counterparts from garnet amphibolites of the Catalina Schist, southern California. An external source for such fluids is suggested by their homogeneous populations coupled with their low salinities. Geologic evidence suggests that the Samana and Franciscan eclogites may have been derived from a Catalina-like source terrane. The Catalina rocks are inferred to have interacted with large volumes of sediment-derived fluid during subduction zone metamorphism at similar P but higher T conditions than those determined for Samana and Franciscan eclogite blocks. These results contrast with data for fluid inclusions from eclogites of the Monviso area, western Alps. The Monviso eclogites yield similar estimates for metamorphic P-T to those obtained in this study, but contain fluid inclusions of brine and of other saline aqueous fluids, all of which are less dense than expected for incorporation at the reported eclogite-facies conditions. The differences between the properties of fluid inclusions from the ecologites and garnet amphibolites of the Samana-Franciscan-Catalina subduction complexes and those of Monviso probably reflect differences between fluid-flow regimes during metamorphism.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00310869

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Effect of verapamil on renal plasma flow, glomerular filtration rate and plasma angiotensin II, aldosterone and arginine vasopressin in essential hypertension (1985)

Sørensen, S. S. ; Thomsen, O. Ø. ; Danielsen, H. ; [et al.]

Springer

European journal of clinical pharmacology 29 (1985), S. 257-261

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ISSN: 1432-1041

Keywords: verapamil ; hypertension ; renal haemodynamics ; glomerular filtration ; arginine vasopressin ; renal function

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Medicine

Notes: Summary Renal plasma flow, glomerular filtration rate plasma angiotensin II, aldosterone and arginine vasopressin, free water clearance, blood pressure and body weight in 11 patients with mild to moderate hypertension were determined at the end of consecutive 6 week periods of administration of placebo and verapamil up to 120 mg t.i.d. Verpamil induced a 10% reduction in diastolic blood pressure. Compared with placebo none of the other parameters measured changed after treatment with verapamil. There was no significant correlation between blood pressure and arginine vasopressin in plasma. It is concluded that verapamil reduced blood pressure by vasodilatation without activation of the counterbalancing mechanisms commonly seen after treatment with vasodilating drugs, i.e. tachycardia, activation of the renin-angiotensin-aldosterone system, water and salt retention, and without affecting renal haemodynamics. AVP does not seem to be involved in blood pressure regulation in mild to moderate essential hypertension.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00544077

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Renal and hormonal effects and tolerance of an ANP analogue in healthy man (1991)

Eiskjær, H. ; Schmiegelow, M. ; Jespersen, B. ; [et al.]

Springer

European journal of clinical pharmacology 41 (1991), S. 547-554

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ISSN: 1432-1041

Keywords: Atrial natriuretic peptide ; P-ANP ; Hormonal effects ; Angiotensin II ; aldosterone ; arginine vasopressin ; PgE2 ; cGMP ; renal plasma flow ; urinary sodium excretion ; healthy volunteers ; blood pressure ; renal tubular function ; adverse effects

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Medicine

Notes: Summary The effect of an analogue of atrial natriuretic peptide (P-ANP) on glomerular filtration rate (GFR), renal plasma flow (RPF), urinary flow rate, urinary sodium excretion, tubular function estimated by the lithium clearance technique, and plasma levels of sodium and water homeostatic hormones, has been studied in 40 healthy males. Placebo or P-ANP 0.3, 1.5, or 3.0 μg·kg−1 bwt were given as an intravenous bolus injection to different groups. P-ANP did not cause any immediate change in GFR or RPF, but significant dose-dependent increases in filtration fraction, urinary flow rate and urinary excretion rate of sodium were detected during the first 30 min after administration. Proximal absolute and fractional tubular reabsorption and distal absolute tubular reabsorption of sodium did not change after injection of P-ANP, while the distal fractional reabsorption of sodium was reduced in a dose dependent manner during the first 30 min. Plasma angiotensin II and aldosterone were significantly increased 30 and 150 min after dosage, whereas plasma atrial natriuretic peptide, plasma arginine vasopressin, and urinary excretion of prostaglandin E2 were unchanged. Cyclic guanosine monophosphate both in plasma and urine were increased in a dose-dependent manner. P-ANP cause a significant reduction in diastolic blood pressure and an increase in pulse rate. Two subjects had vasovagal syncope 30–60 min after injection of P-ANP. It is concluded that P-ANP has natriuretic, diuretic and hypotensive properties in healthy man.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00314983

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